﻿/**
 * @license Copyright (c) 2003-2014, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or http://ckeditor.com/license
 */

/**
 * @fileOverview The floating dialog plugin.
 */

/**
 * No resize for this dialog.
 *
 * @readonly
 * @property {Number} [=0]
 * @member CKEDITOR
 */
CKEDITOR.DIALOG_RESIZE_NONE = 0;

/**
 * Only allow horizontal resizing for this dialog, disable vertical resizing.
 *
 * @readonly
 * @property {Number} [=1]
 * @member CKEDITOR
 */
CKEDITOR.DIALOG_RESIZE_WIDTH = 1;

/**
 * Only allow vertical resizing for this dialog, disable horizontal resizing.
 *
 * @readonly
 * @property {Number} [=2]
 * @member CKEDITOR
 */
CKEDITOR.DIALOG_RESIZE_HEIGHT = 2;

/**
 * Allow the dialog to be resized in both directions.
 *
 * @readonly
 * @property {Number} [=3]
 * @member CKEDITOR
 */
CKEDITOR.DIALOG_RESIZE_BOTH = 3;

(function () {
    var cssLength = CKEDITOR.tools.cssLength;

    function isTabVisible(tabId) {
        return !!this._.tabs[tabId][0].$.offsetHeight;
    }

    function getPreviousVisibleTab() {
        var tabId = this._.currentTabId,
            length = this._.tabIdList.length,
            tabIndex = CKEDITOR.tools.indexOf(this._.tabIdList, tabId) + length;

        for (var i = tabIndex - 1; i > tabIndex - length; i--) {
            if (isTabVisible.call(this, this._.tabIdList[i % length]))
                return this._.tabIdList[i % length];
        }

        return null;
    }

    function getNextVisibleTab() {
        var tabId = this._.currentTabId,
            length = this._.tabIdList.length,
            tabIndex = CKEDITOR.tools.indexOf(this._.tabIdList, tabId);

        for (var i = tabIndex + 1; i < tabIndex + length; i++) {
            if (isTabVisible.call(this, this._.tabIdList[i % length]))
                return this._.tabIdList[i % length];
        }

        return null;
    }


    function clearOrRecoverTextInputValue(container, isRecover) {
        var inputs = container.$.getElementsByTagName('input');
        for (var i = 0, length = inputs.length; i < length; i++) {
            var item = new CKEDITOR.dom.element(inputs[i]);

            if (item.getAttribute('type').toLowerCase() == 'text') {
                if (isRecover) {
                    item.setAttribute('value', item.getCustomData('fake_value') || '');
                    item.removeCustomData('fake_value');
                } else {
                    item.setCustomData('fake_value', item.getAttribute('value'));
                    item.setAttribute('value', '');
                }
            }
        }
    }

    // Handle dialog element validation state UI changes.
    function handleFieldValidated(isValid, msg) {
        var input = this.getInputElement();
        if (input)
            isValid ? input.removeAttribute('aria-invalid') : input.setAttribute('aria-invalid', true);

        if (!isValid) {
            if (this.select)
                this.select();
            else
                this.focus();
        }

        msg && alert(msg);

        this.fire('validated', {valid: isValid, msg: msg});
    }

    function resetField() {
        var input = this.getInputElement();
        input && input.removeAttribute('aria-invalid');
    }

    var templateSource = '<div class="cke_reset_all {editorId} {editorDialogClass} {hidpi}' +
        '" dir="{langDir}"' +
        ' lang="{langCode}"' +
        ' role="dialog"' +
        ' aria-labelledby="cke_dialog_title_{id}"' +
        '>' +
        '<table class="cke_dialog ' + CKEDITOR.env.cssClass + ' cke_{langDir}"' +
        ' style="position:absolute" role="presentation">' +
        '<tr><td role="presentation">' +
        '<div class="cke_dialog_body" role="presentation">' +
        '<div id="cke_dialog_title_{id}" class="cke_dialog_title" role="presentation"></div>' +
        '<a id="cke_dialog_close_button_{id}" class="cke_dialog_close_button" href="javascript:void(0)" title="{closeTitle}" role="button"><span class="cke_label">X</span></a>' +
        '<div id="cke_dialog_tabs_{id}" class="cke_dialog_tabs" role="tablist"></div>' +
        '<table class="cke_dialog_contents" role="presentation">' +
        '<tr>' +
        '<td id="cke_dialog_contents_{id}" class="cke_dialog_contents_body" role="presentation"></td>' +
        '</tr>' +
        '<tr>' +
        '<td id="cke_dialog_footer_{id}" class="cke_dialog_footer" role="presentation"></td>' +
        '</tr>' +
        '</table>' +
        '</div>' +
        '</td></tr>' +
        '</table>' +
        '</div>';

    function buildDialog(editor) {
        var element = CKEDITOR.dom.element.createFromHtml(CKEDITOR.addTemplate('dialog', templateSource).output({
            id: CKEDITOR.tools.getNextNumber(),
            editorId: editor.id,
            langDir: editor.lang.dir,
            langCode: editor.langCode,
            editorDialogClass: 'cke_editor_' + editor.name.replace(/\./g, '\\.') + '_dialog',
            closeTitle: editor.lang.common.close,
            hidpi: CKEDITOR.env.hidpi ? 'cke_hidpi' : ''
        }));

        // TODO: Change this to getById(), so it'll support custom templates.
        var body = element.getChild([0, 0, 0, 0, 0]),
            title = body.getChild(0),
            close = body.getChild(1);

        // IFrame shim for dialog that masks activeX in IE. (#7619)
        if (CKEDITOR.env.ie && !CKEDITOR.env.quirks) {
            var src = 'javascript:void(function(){' + encodeURIComponent('document.open();(' + CKEDITOR.tools.fixDomain + ')();document.close();') + '}())',
                iframe = CKEDITOR.dom.element.createFromHtml('<iframe' +
                    ' frameBorder="0"' +
                    ' class="cke_iframe_shim"' +
                    ' src="' + src + '"' +
                    ' tabIndex="-1"' +
                    '></iframe>');
            iframe.appendTo(body.getParent());
        }

        // Make the Title and Close Button unselectable.
        title.unselectable();
        close.unselectable();

        return {
            element: element,
            parts: {
                dialog: element.getChild(0),
                title: title,
                close: close,
                tabs: body.getChild(2),
                contents: body.getChild([3, 0, 0, 0]),
                footer: body.getChild([3, 0, 1, 0])
            }
        };
    }

    /**
     * This is the base class for runtime dialog objects. An instance of this
     * class represents a single named dialog for a single editor instance.
     *
     *        var dialogObj = new CKEDITOR.dialog( editor, 'smiley' );
     *
     * @class
     * @constructor Creates a dialog class instance.
     * @param {Object} editor The editor which created the dialog.
     * @param {String} dialogName The dialog's registered name.
     */
    CKEDITOR.dialog = function (editor, dialogName) {
        // Load the dialog definition.
        var definition = CKEDITOR.dialog._.dialogDefinitions[dialogName],
            defaultDefinition = CKEDITOR.tools.clone(defaultDialogDefinition),
            buttonsOrder = editor.config.dialog_buttonsOrder || 'OS',
            dir = editor.lang.dir,
            tabsToRemove = {},
            i, processed, stopPropagation;

        if ((buttonsOrder == 'OS' && CKEDITOR.env.mac) || // The buttons in MacOS Apps are in reverse order (#4750)
            (buttonsOrder == 'rtl' && dir == 'ltr') || (buttonsOrder == 'ltr' && dir == 'rtl'))
            defaultDefinition.buttons.reverse();


        // Completes the definition with the default values.
        definition = CKEDITOR.tools.extend(definition(editor), defaultDefinition);

        // Clone a functionally independent copy for this dialog.
        definition = CKEDITOR.tools.clone(definition);

        // Create a complex definition object, extending it with the API
        // functions.
        definition = new definitionObject(this, definition);

        var doc = CKEDITOR.document;

        var themeBuilt = buildDialog(editor);

        // Initialize some basic parameters.
        this._ = {
            editor: editor,
            element: themeBuilt.element,
            name: dialogName,
            contentSize: {width: 0, height: 0},
            size: {width: 0, height: 0},
            contents: {},
            buttons: {},
            accessKeyMap: {},

            // Initialize the tab and page map.
            tabs: {},
            tabIdList: [],
            currentTabId: null,
            currentTabIndex: null,
            pageCount: 0,
            lastTab: null,
            tabBarMode: false,

            // Initialize the tab order array for input widgets.
            focusList: [],
            currentFocusIndex: 0,
            hasFocus: false
        };

        this.parts = themeBuilt.parts;

        CKEDITOR.tools.setTimeout(function () {
            editor.fire('ariaWidget', this.parts.contents);
        }, 0, this);

        // Set the startup styles for the dialog, avoiding it enlarging the
        // page size on the dialog creation.
        var startStyles = {
            position: CKEDITOR.env.ie6Compat ? 'absolute' : 'fixed',
            top: 0,
            visibility: 'hidden'
        };

        startStyles[dir == 'rtl' ? 'right' : 'left'] = 0;
        this.parts.dialog.setStyles(startStyles);


        // Call the CKEDITOR.event constructor to initialize this instance.
        CKEDITOR.event.call(this);

        // Fire the "dialogDefinition" event, making it possible to customize
        // the dialog definition.
        this.definition = definition = CKEDITOR.fire('dialogDefinition', {
            name: dialogName,
            definition: definition
        }, editor).definition;

        // Cache tabs that should be removed.
        if (!('removeDialogTabs' in editor._) && editor.config.removeDialogTabs) {
            var removeContents = editor.config.removeDialogTabs.split(';');

            for (i = 0; i < removeContents.length; i++) {
                var parts = removeContents[i].split(':');
                if (parts.length == 2) {
                    var removeDialogName = parts[0];
                    if (!tabsToRemove[removeDialogName])
                        tabsToRemove[removeDialogName] = [];
                    tabsToRemove[removeDialogName].push(parts[1]);
                }
            }
            editor._.removeDialogTabs = tabsToRemove;
        }

        // Remove tabs of this dialog.
        if (editor._.removeDialogTabs && (tabsToRemove = editor._.removeDialogTabs[dialogName])) {
            for (i = 0; i < tabsToRemove.length; i++)
                definition.removeContents(tabsToRemove[i]);
        }

        // Initialize load, show, hide, ok and cancel events.
        if (definition.onLoad)
            this.on('load', definition.onLoad);

        if (definition.onShow)
            this.on('show', definition.onShow);

        if (definition.onHide)
            this.on('hide', definition.onHide);

        if (definition.onOk) {
            this.on('ok', function (evt) {
                // Dialog confirm might probably introduce content changes (#5415).
                editor.fire('saveSnapshot');
                setTimeout(function () {
                    editor.fire('saveSnapshot');
                }, 0);
                if (definition.onOk.call(this, evt) === false)
                    evt.data.hide = false;
            });
        }

        if (definition.onCancel) {
            this.on('cancel', function (evt) {
                if (definition.onCancel.call(this, evt) === false)
                    evt.data.hide = false;
            });
        }

        var me = this;

        // Iterates over all items inside all content in the dialog, calling a
        // function for each of them.
        var iterContents = function (func) {
            var contents = me._.contents,
                stop = false;

            for (var i in contents) {
                for (var j in contents[i]) {
                    stop = func.call(this, contents[i][j]);
                    if (stop)
                        return;
                }
            }
        };

        this.on('ok', function (evt) {
            iterContents(function (item) {
                if (item.validate) {
                    var retval = item.validate(this),
                        invalid = typeof (retval) == 'string' || retval === false;

                    if (invalid) {
                        evt.data.hide = false;
                        evt.stop();
                    }

                    handleFieldValidated.call(item, !invalid, typeof retval == 'string' ? retval : undefined);
                    return invalid;
                }
            });
        }, this, null, 0);

        this.on('cancel', function (evt) {
            iterContents(function (item) {
                if (item.isChanged()) {
                    if (!editor.config.dialog_noConfirmCancel && !confirm(editor.lang.common.confirmCancel))
                        evt.data.hide = false;
                    return true;
                }
            });
        }, this, null, 0);

        this.parts.close.on('click', function (evt) {
            if (this.fire('cancel', {hide: true}).hide !== false)
                this.hide();
            evt.data.preventDefault();
        }, this);

        // Sort focus list according to tab order definitions.
        function setupFocus() {
            var focusList = me._.focusList;
            focusList.sort(function (a, b) {
                // Mimics browser tab order logics;
                if (a.tabIndex != b.tabIndex)
                    return b.tabIndex - a.tabIndex;
                    //  Sort is not stable in some browsers,
                // fall-back the comparator to 'focusIndex';
                else
                    return a.focusIndex - b.focusIndex;
            });

            var size = focusList.length;
            for (var i = 0; i < size; i++)
                focusList[i].focusIndex = i;
        }

        function changeFocus(offset) {
            var focusList = me._.focusList;
            offset = offset || 0;

            if (focusList.length < 1)
                return;

            var current = me._.currentFocusIndex;

            // Trigger the 'blur' event of  any input element before anything,
            // since certain UI updates may depend on it.
            try {
                focusList[current].getInputElement().$.blur();
            } catch (e) {
            }

            var startIndex = (current + offset + focusList.length) % focusList.length,
                currentIndex = startIndex;
            while (offset && !focusList[currentIndex].isFocusable()) {
                currentIndex = (currentIndex + offset + focusList.length) % focusList.length;
                if (currentIndex == startIndex)
                    break;
            }

            focusList[currentIndex].focus();

            // Select whole field content.
            if (focusList[currentIndex].type == 'text')
                focusList[currentIndex].select();
        }

        this.changeFocus = changeFocus;


        function keydownHandler(evt) {
            // If I'm not the top dialog, ignore.
            if (me != CKEDITOR.dialog._.currentTop)
                return;

            var keystroke = evt.data.getKeystroke(),
                rtl = editor.lang.dir == 'rtl',
                button;

            processed = stopPropagation = 0;

            if (keystroke == 9 || keystroke == CKEDITOR.SHIFT + 9) {
                var shiftPressed = (keystroke == CKEDITOR.SHIFT + 9);

                // Handling Tab and Shift-Tab.
                if (me._.tabBarMode) {
                    // Change tabs.
                    var nextId = shiftPressed ? getPreviousVisibleTab.call(me) : getNextVisibleTab.call(me);
                    me.selectPage(nextId);
                    me._.tabs[nextId][0].focus();
                } else {
                    // Change the focus of inputs.
                    changeFocus(shiftPressed ? -1 : 1);
                }

                processed = 1;
            } else if (keystroke == CKEDITOR.ALT + 121 && !me._.tabBarMode && me.getPageCount() > 1) {
                // Alt-F10 puts focus into the current tab item in the tab bar.
                me._.tabBarMode = true;
                me._.tabs[me._.currentTabId][0].focus();
                processed = 1;
            } else if ((keystroke == 37 || keystroke == 39) && me._.tabBarMode) {
                // Arrow keys - used for changing tabs.
                nextId = (keystroke == (rtl ? 39 : 37) ? getPreviousVisibleTab.call(me) : getNextVisibleTab.call(me));
                me.selectPage(nextId);
                me._.tabs[nextId][0].focus();
                processed = 1;
            } else if ((keystroke == 13 || keystroke == 32) && me._.tabBarMode) {
                this.selectPage(this._.currentTabId);
                this._.tabBarMode = false;
                this._.currentFocusIndex = -1;
                changeFocus(1);
                processed = 1;
            }
            // If user presses enter key in a text box, it implies clicking OK for the dialog.
            else if (keystroke == 13 /*ENTER*/) {
                // Don't do that for a target that handles ENTER.
                var target = evt.data.getTarget();
                if (!target.is('a', 'button', 'select', 'textarea') && (!target.is('input') || target.$.type != 'button')) {
                    button = this.getButton('ok');
                    button && CKEDITOR.tools.setTimeout(button.click, 0, button);
                    processed = 1;
                }
                stopPropagation = 1; // Always block the propagation (#4269)
            } else if (keystroke == 27 /*ESC*/) {
                button = this.getButton('cancel');

                // If there's a Cancel button, click it, else just fire the cancel event and hide the dialog.
                if (button)
                    CKEDITOR.tools.setTimeout(button.click, 0, button);
                else {
                    if (this.fire('cancel', {hide: true}).hide !== false)
                        this.hide();
                }
                stopPropagation = 1; // Always block the propagation (#4269)
            } else
                return;

            keypressHandler(evt);
        }

        function keypressHandler(evt) {
            if (processed)
                evt.data.preventDefault(1);
            else if (stopPropagation)
                evt.data.stopPropagation();
        }

        var dialogElement = this._.element;

        editor.focusManager.add(dialogElement, 1);

        // Add the dialog keyboard handlers.
        this.on('show', function () {
            dialogElement.on('keydown', keydownHandler, this);

            // Some browsers instead, don't cancel key events in the keydown, but in the
            // keypress. So we must do a longer trip in those cases. (#4531,#8985)
            if (CKEDITOR.env.gecko)
                dialogElement.on('keypress', keypressHandler, this);

        });
        this.on('hide', function () {
            dialogElement.removeListener('keydown', keydownHandler);
            if (CKEDITOR.env.gecko)
                dialogElement.removeListener('keypress', keypressHandler);

            // Reset fields state when closing dialog.
            iterContents(function (item) {
                resetField.apply(item);
            });
        });
        this.on('iframeAdded', function (evt) {
            var doc = new CKEDITOR.dom.document(evt.data.iframe.$.contentWindow.document);
            doc.on('keydown', keydownHandler, this, null, 0);
        });

        // Auto-focus logic in dialog.
        this.on('show', function () {
            // Setup tabIndex on showing the dialog instead of on loading
            // to allow dynamic tab order happen in dialog definition.
            setupFocus();

            if (editor.config.dialog_startupFocusTab && me._.pageCount > 1) {
                me._.tabBarMode = true;
                me._.tabs[me._.currentTabId][0].focus();
            } else if (!this._.hasFocus) {
                this._.currentFocusIndex = -1;

                // Decide where to put the initial focus.
                if (definition.onFocus) {
                    var initialFocus = definition.onFocus.call(this);
                    // Focus the field that the user specified.
                    initialFocus && initialFocus.focus();
                }
                // Focus the first field in layout order.
                else
                    changeFocus(1);
            }
        }, this, null, 0xffffffff);

        // IE6 BUG: Text fields and text areas are only half-rendered the first time the dialog appears in IE6 (#2661).
        // This is still needed after [2708] and [2709] because text fields in hidden TR tags are still broken.
        if (CKEDITOR.env.ie6Compat) {
            this.on('load', function (evt) {
                var outer = this.getElement(),
                    inner = outer.getFirst();
                inner.remove();
                inner.appendTo(outer);
            }, this);
        }

        initDragAndDrop(this);
        initResizeHandles(this);

        // Insert the title.
        (new CKEDITOR.dom.text(definition.title, CKEDITOR.document)).appendTo(this.parts.title);

        // Insert the tabs and contents.
        for (i = 0; i < definition.contents.length; i++) {
            var page = definition.contents[i];
            page && this.addPage(page);
        }

        this.parts['tabs'].on('click', function (evt) {
            var target = evt.data.getTarget();
            // If we aren't inside a tab, bail out.
            if (target.hasClass('cke_dialog_tab')) {
                // Get the ID of the tab, without the 'cke_' prefix and the unique number suffix.
                var id = target.$.id;
                this.selectPage(id.substring(4, id.lastIndexOf('_')));

                if (this._.tabBarMode) {
                    this._.tabBarMode = false;
                    this._.currentFocusIndex = -1;
                    changeFocus(1);
                }
                evt.data.preventDefault();
            }
        }, this);

        // Insert buttons.
        var buttonsHtml = [],
            buttons = CKEDITOR.dialog._.uiElementBuilders.hbox.build(this, {
                type: 'hbox',
                className: 'cke_dialog_footer_buttons',
                widths: [],
                children: definition.buttons
            }, buttonsHtml).getChild();
        this.parts.footer.setHtml(buttonsHtml.join(''));

        for (i = 0; i < buttons.length; i++)
            this._.buttons[buttons[i].id] = buttons[i];
    };

    // Focusable interface. Use it via dialog.addFocusable.
    function Focusable(dialog, element, index) {
        this.element = element;
        this.focusIndex = index;
        // TODO: support tabIndex for focusables.
        this.tabIndex = 0;
        this.isFocusable = function () {
            return !element.getAttribute('disabled') && element.isVisible();
        };
        this.focus = function () {
            dialog._.currentFocusIndex = this.focusIndex;
            this.element.focus();
        };
        // Bind events
        element.on('keydown', function (e) {
            if (e.data.getKeystroke() in {32: 1, 13: 1})
                this.fire('click');
        });
        element.on('focus', function () {
            this.fire('mouseover');
        });
        element.on('blur', function () {
            this.fire('mouseout');
        });
    }

    // Re-layout the dialog on window resize.
    function resizeWithWindow(dialog) {
        var win = CKEDITOR.document.getWindow();

        function resizeHandler() {
            dialog.layout();
        }

        win.on('resize', resizeHandler);
        dialog.on('hide', function () {
            win.removeListener('resize', resizeHandler);
        });
    }

    CKEDITOR.dialog.prototype = {
        destroy: function () {
            this.hide();
            this._.element.remove();
        },

        /**
         * Resizes the dialog.
         *
         *        dialogObj.resize( 800, 640 );
         *
         * @method
         * @param {Number} width The width of the dialog in pixels.
         * @param {Number} height The height of the dialog in pixels.
         */
        resize: (function () {
            return function (width, height) {
                if (this._.contentSize && this._.contentSize.width == width && this._.contentSize.height == height)
                    return;

                CKEDITOR.dialog.fire('resize', {
                    dialog: this,
                    width: width,
                    height: height
                }, this._.editor);

                this.fire('resize', {
                    width: width,
                    height: height
                }, this._.editor);

                var contents = this.parts.contents;
                contents.setStyles({
                    width: width + 'px',
                    height: height + 'px'
                });

                // Update dialog position when dimension get changed in RTL.
                if (this._.editor.lang.dir == 'rtl' && this._.position)
                    this._.position.x = CKEDITOR.document.getWindow().getViewPaneSize().width - this._.contentSize.width - parseInt(this._.element.getFirst().getStyle('right'), 10);

                this._.contentSize = {width: width, height: height};
            };
        })(),

        /**
         * Gets the current size of the dialog in pixels.
         *
         * var width = dialogObj.getSize().width;
         *
         * @returns {Object}
         * @returns {Number} return.width
         * @returns {Number} return.height
         */
        getSize: function () {
            var element = this._.element.getFirst();
            return {width: element.$.offsetWidth || 0, height: element.$.offsetHeight || 0};
        },

        /**
         * Moves the dialog to an `(x, y)` coordinate relative to the window.
         *
         * dialogObj.move( 10, 40 );
         *
         * @method
         * @param {Number} x The target x-coordinate.
         * @param {Number} y The target y-coordinate.
         * @param {Boolean} save Flag indicate whether the dialog position should be remembered on next open up.
         */
        move: function (x, y, save) {

            // The dialog may be fixed positioned or absolute positioned. Ask the
            // browser what is the current situation first.
            var element = this._.element.getFirst(), rtl = this._.editor.lang.dir == 'rtl';
            var isFixed = element.getComputedStyle('position') == 'fixed';

            // (#8888) In some cases of a very small viewport, dialog is incorrectly
            // positioned in IE7. It also happens that it remains sticky and user cannot
            // scroll down/up to reveal dialog's content below/above the viewport; this is
            // cumbersome.
            // The only way to fix this is to move mouse out of the browser and
            // go back to see that dialog position is automagically fixed. No events,
            // no style change - pure magic. This is a IE7 rendering issue, which can be
            // fixed with dummy style redraw on each move.
            if (CKEDITOR.env.ie)
                element.setStyle('zoom', '100%');

            if (isFixed && this._.position && this._.position.x == x && this._.position.y == y)
                return;

            // Save the current position.
            this._.position = {x: x, y: y};

            // If not fixed positioned, add scroll position to the coordinates.
            if (!isFixed) {
                var scrollPosition = CKEDITOR.document.getWindow().getScrollPosition();
                x += scrollPosition.x;
                y += scrollPosition.y;
            }

            // Translate coordinate for RTL.
            if (rtl) {
                var dialogSize = this.getSize(), viewPaneSize = CKEDITOR.document.getWindow().getViewPaneSize();
                x = viewPaneSize.width - dialogSize.width - x;
            }

            var styles = {'top': (y > 0 ? y : 0) + 'px'};
            styles[rtl ? 'right' : 'left'] = (x > 0 ? x : 0) + 'px';

            element.setStyles(styles);

            save && (this._.moved = 1);
        },

        /**
         * Gets the dialog's position in the window.
         *
         *        var dialogX = dialogObj.getPosition().x;
         *
         * @returns {Object}
         * @returns {Number} return.x
         * @returns {Number} return.y
         */
        getPosition: function () {
            return CKEDITOR.tools.extend({}, this._.position);
        },

        /**
         * Shows the dialog box.
         *
         *        dialogObj.show();
         */
        show: function () {
            // Insert the dialog's element to the root document.
            var element = this._.element;
            var definition = this.definition;
            if (!(element.getParent() && element.getParent().equals(CKEDITOR.document.getBody())))
                element.appendTo(CKEDITOR.document.getBody());
            else
                element.setStyle('display', 'block');

            // First, set the dialog to an appropriate size.
            this.resize(this._.contentSize && this._.contentSize.width || definition.width || definition.minWidth, this._.contentSize && this._.contentSize.height || definition.height || definition.minHeight);

            // Reset all inputs back to their default value.
            this.reset();

            // Select the first tab by default.
            this.selectPage(this.definition.contents[0].id);

            // Set z-index.
            if (CKEDITOR.dialog._.currentZIndex === null)
                CKEDITOR.dialog._.currentZIndex = this._.editor.config.baseFloatZIndex;
            this._.element.getFirst().setStyle('z-index', CKEDITOR.dialog._.currentZIndex += 10);

            // Maintain the dialog ordering and dialog cover.
            if (CKEDITOR.dialog._.currentTop === null) {
                CKEDITOR.dialog._.currentTop = this;
                this._.parentDialog = null;
                showCover(this._.editor);

            } else {
                this._.parentDialog = CKEDITOR.dialog._.currentTop;
                var parentElement = this._.parentDialog.getElement().getFirst();
                parentElement.$.style.zIndex -= Math.floor(this._.editor.config.baseFloatZIndex / 2);
                CKEDITOR.dialog._.currentTop = this;
            }

            element.on('keydown', accessKeyDownHandler);
            element.on('keyup', accessKeyUpHandler);

            // Reset the hasFocus state.
            this._.hasFocus = false;

            for (var i in definition.contents) {
                if (!definition.contents[i])
                    continue;

                var content = definition.contents[i],
                    tab = this._.tabs[content.id],
                    requiredContent = content.requiredContent,
                    enableElements = 0;

                if (!tab)
                    continue;

                for (var j in this._.contents[content.id]) {
                    var elem = this._.contents[content.id][j];

                    if (elem.type == 'hbox' || elem.type == 'vbox' || !elem.getInputElement())
                        continue;

                    if (elem.requiredContent && !this._.editor.activeFilter.check(elem.requiredContent))
                        elem.disable();
                    else {
                        elem.enable();
                        enableElements++;
                    }
                }

                if (!enableElements || (requiredContent && !this._.editor.activeFilter.check(requiredContent)))
                    tab[0].addClass('cke_dialog_tab_disabled');
                else
                    tab[0].removeClass('cke_dialog_tab_disabled');
            }

            CKEDITOR.tools.setTimeout(function () {
                this.layout();
                resizeWithWindow(this);

                this.parts.dialog.setStyle('visibility', '');

                // Execute onLoad for the first show.
                this.fireOnce('load', {});
                CKEDITOR.ui.fire('ready', this);

                this.fire('show', {});
                this._.editor.fire('dialogShow', this);

                if (!this._.parentDialog)
                    this._.editor.focusManager.lock();

                // Save the initial values of the dialog.
                this.foreach(function (contentObj) {
                    contentObj.setInitValue && contentObj.setInitValue();
                });

            }, 100, this);
        },

        /**
         * Rearrange the dialog to its previous position or the middle of the window.
         *
         * @since 3.5
         */
        layout: function () {
            var el = this.parts.dialog;
            var dialogSize = this.getSize();
            var win = CKEDITOR.document.getWindow(),
                viewSize = win.getViewPaneSize();

            var posX = (viewSize.width - dialogSize.width) / 2,
                posY = (viewSize.height - dialogSize.height) / 2;

            // Switch to absolute position when viewport is smaller than dialog size.
            if (!CKEDITOR.env.ie6Compat) {
                if (dialogSize.height + (posY > 0 ? posY : 0) > viewSize.height ||
                    dialogSize.width + (posX > 0 ? posX : 0) > viewSize.width)
                    el.setStyle('position', 'absolute');
                else
                    el.setStyle('position', 'fixed');
            }

            this.move(this._.moved ? this._.position.x : posX,
                this._.moved ? this._.position.y : posY);
        },

        /**
         * Executes a function for each UI element.
         *
         * @param {Function} fn Function to execute for each UI element.
         * @returns {CKEDITOR.dialog} The current dialog object.
         */
        foreach: function (fn) {
            for (var i in this._.contents) {
                for (var j in this._.contents[i])
                    fn.call(this, this._.contents[i][j]);
            }
            return this;
        },

        /**
         * Resets all input values in the dialog.
         *
         *        dialogObj.reset();
         *
         * @method
         * @chainable
         */
        reset: (function () {
            var fn = function (widget) {
                if (widget.reset)
                    widget.reset(1);
            };
            return function () {
                this.foreach(fn);
                return this;
            };
        })(),


        /**
         * Calls the {@link CKEDITOR.dialog.definition.uiElement#setup} method of each
         * of the UI elements, with the arguments passed through it.
         * It is usually being called when the dialog is opened, to put the initial value inside the field.
         *
         *        dialogObj.setupContent();
         *
         *        var timestamp = ( new Date() ).valueOf();
         *        dialogObj.setupContent( timestamp );
         */
        setupContent: function () {
            var args = arguments;
            this.foreach(function (widget) {
                if (widget.setup)
                    widget.setup.apply(widget, args);
            });
        },

        /**
         * Calls the {@link CKEDITOR.dialog.definition.uiElement#commit} method of each
         * of the UI elements, with the arguments passed through it.
         * It is usually being called when the user confirms the dialog, to process the values.
         *
         *        dialogObj.commitContent();
         *
         *        var timestamp = ( new Date() ).valueOf();
         *        dialogObj.commitContent( timestamp );
         */
        commitContent: function () {
            var args = arguments;
            this.foreach(function (widget) {
                // Make sure IE triggers "change" event on last focused input before closing the dialog. (#7915)
                if (CKEDITOR.env.ie && this._.currentFocusIndex == widget.focusIndex)
                    widget.getInputElement().$.blur();

                if (widget.commit)
                    widget.commit.apply(widget, args);
            });
        },

        /**
         * Hides the dialog box.
         *
         *        dialogObj.hide();
         */
        hide: function () {
            if (!this.parts.dialog.isVisible())
                return;

            this.fire('hide', {});
            this._.editor.fire('dialogHide', this);
            // Reset the tab page.
            this.selectPage(this._.tabIdList[0]);
            var element = this._.element;
            element.setStyle('display', 'none');
            this.parts.dialog.setStyle('visibility', 'hidden');
            // Unregister all access keys associated with this dialog.
            unregisterAccessKey(this);

            // Close any child(top) dialogs first.
            while (CKEDITOR.dialog._.currentTop != this)
                CKEDITOR.dialog._.currentTop.hide();

            // Maintain dialog ordering and remove cover if needed.
            if (!this._.parentDialog)
                hideCover(this._.editor);
            else {
                var parentElement = this._.parentDialog.getElement().getFirst();
                parentElement.setStyle('z-index', parseInt(parentElement.$.style.zIndex, 10) + Math.floor(this._.editor.config.baseFloatZIndex / 2));
            }
            CKEDITOR.dialog._.currentTop = this._.parentDialog;

            // Deduct or clear the z-index.
            if (!this._.parentDialog) {
                CKEDITOR.dialog._.currentZIndex = null;

                // Remove access key handlers.
                element.removeListener('keydown', accessKeyDownHandler);
                element.removeListener('keyup', accessKeyUpHandler);

                var editor = this._.editor;
                editor.focus();

                // Give a while before unlock, waiting for focus to return to the editable. (#172)
                setTimeout(function () {
                    editor.focusManager.unlock();
                }, 0);

            } else
                CKEDITOR.dialog._.currentZIndex -= 10;

            delete this._.parentDialog;
            // Reset the initial values of the dialog.
            this.foreach(function (contentObj) {
                contentObj.resetInitValue && contentObj.resetInitValue();
            });
        },

        /**
         * Adds a tabbed page into the dialog.
         *
         * @param {Object} contents Content definition.
         */
        addPage: function (contents) {
            if (contents.requiredContent && !this._.editor.filter.check(contents.requiredContent))
                return;

            var pageHtml = [],
                titleHtml = contents.label ? ' title="' + CKEDITOR.tools.htmlEncode(contents.label) + '"' : '',
                elements = contents.elements,
                vbox = CKEDITOR.dialog._.uiElementBuilders.vbox.build(this, {
                    type: 'vbox',
                    className: 'cke_dialog_page_contents',
                    children: contents.elements,
                    expand: !!contents.expand,
                    padding: contents.padding,
                    style: contents.style || 'width: 100%;'
                }, pageHtml);

            var contentMap = this._.contents[contents.id] = {},
                cursor,
                children = vbox.getChild(),
                enabledFields = 0;

            while ((cursor = children.shift())) {
                // Count all allowed fields.
                if (!cursor.notAllowed && cursor.type != 'hbox' && cursor.type != 'vbox')
                    enabledFields++;

                contentMap[cursor.id] = cursor;
                if (typeof (cursor.getChild) == 'function')
                    children.push.apply(children, cursor.getChild());
            }

            // If all fields are disabled (because they are not allowed) hide this tab.
            if (!enabledFields)
                contents.hidden = true;

            // Create the HTML for the tab and the content block.
            var page = CKEDITOR.dom.element.createFromHtml(pageHtml.join(''));
            page.setAttribute('role', 'tabpanel');

            var env = CKEDITOR.env;
            var tabId = 'cke_' + contents.id + '_' + CKEDITOR.tools.getNextNumber(),
                tab = CKEDITOR.dom.element.createFromHtml([
                    '<a class="cke_dialog_tab"',
                    (this._.pageCount > 0 ? ' cke_last' : 'cke_first'),
                    titleHtml,
                    (!!contents.hidden ? ' style="display:none"' : ''),
                    ' id="', tabId, '"',
                    env.gecko && !env.hc ? '' : ' href="javascript:void(0)"',
                    ' tabIndex="-1"',
                    ' hidefocus="true"',
                    ' role="tab">',
                    contents.label,
                    '</a>'
                ].join(''));

            page.setAttribute('aria-labelledby', tabId);

            // Take records for the tabs and elements created.
            this._.tabs[contents.id] = [tab, page];
            this._.tabIdList.push(contents.id);
            !contents.hidden && this._.pageCount++;
            this._.lastTab = tab;
            this.updateStyle();

            // Attach the DOM nodes.

            page.setAttribute('name', contents.id);
            page.appendTo(this.parts.contents);

            tab.unselectable();
            this.parts.tabs.append(tab);

            // Add access key handlers if access key is defined.
            if (contents.accessKey) {
                registerAccessKey(this, this, 'CTRL+' + contents.accessKey, tabAccessKeyDown, tabAccessKeyUp);
                this._.accessKeyMap['CTRL+' + contents.accessKey] = contents.id;
            }
        },

        /**
         * Activates a tab page in the dialog by its id.
         *
         *        dialogObj.selectPage( 'tab_1' );
         *
         * @param {String} id The id of the dialog tab to be activated.
         */
        selectPage: function (id) {
            if (this._.currentTabId == id)
                return;

            if (this._.tabs[id][0].hasClass('cke_dialog_tab_disabled'))
                return;

            // If event was canceled - do nothing.
            if (this.fire('selectPage', {page: id, currentPage: this._.currentTabId}) === false)
                return;

            // Hide the non-selected tabs and pages.
            for (var i in this._.tabs) {
                var tab = this._.tabs[i][0],
                    page = this._.tabs[i][1];
                if (i != id) {
                    tab.removeClass('cke_dialog_tab_selected');
                    page.hide();
                }
                page.setAttribute('aria-hidden', i != id);
            }

            var selected = this._.tabs[id];
            selected[0].addClass('cke_dialog_tab_selected');

            // [IE] an invisible input[type='text'] will enlarge it's width
            // if it's value is long when it shows, so we clear it's value
            // before it shows and then recover it (#5649)
            if (CKEDITOR.env.ie6Compat || CKEDITOR.env.ie7Compat) {
                clearOrRecoverTextInputValue(selected[1]);
                selected[1].show();
                setTimeout(function () {
                    clearOrRecoverTextInputValue(selected[1], 1);
                }, 0);
            } else
                selected[1].show();

            this._.currentTabId = id;
            this._.currentTabIndex = CKEDITOR.tools.indexOf(this._.tabIdList, id);
        },

        /**
         * Dialog state-specific style updates.
         */
        updateStyle: function () {
            // If only a single page shown, a different style is used in the central pane.
            this.parts.dialog[(this._.pageCount === 1 ? 'add' : 'remove') + 'Class']('cke_single_page');
        },

        /**
         * Hides a page's tab away from the dialog.
         *
         *        dialog.hidePage( 'tab_3' );
         *
         * @param {String} id The page's Id.
         */
        hidePage: function (id) {
            var tab = this._.tabs[id] && this._.tabs[id][0];
            if (!tab || this._.pageCount == 1 || !tab.isVisible())
                return;
            // Switch to other tab first when we're hiding the active tab.
            else if (id == this._.currentTabId)
                this.selectPage(getPreviousVisibleTab.call(this));

            tab.hide();
            this._.pageCount--;
            this.updateStyle();
        },

        /**
         * Unhides a page's tab.
         *
         *        dialog.showPage( 'tab_2' );
         *
         * @param {String} id The page's Id.
         */
        showPage: function (id) {
            var tab = this._.tabs[id] && this._.tabs[id][0];
            if (!tab)
                return;
            tab.show();
            this._.pageCount++;
            this.updateStyle();
        },

        /**
         * Gets the root DOM element of the dialog.
         *
         *        var dialogElement = dialogObj.getElement().getFirst();
         *        dialogElement.setStyle( 'padding', '5px' );
         *
         * @returns {CKEDITOR.dom.element} The `<span>` element containing this dialog.
         */
        getElement: function () {
            return this._.element;
        },

        /**
         * Gets the name of the dialog.
         *
         *        var dialogName = dialogObj.getName();
         *
         * @returns {String} The name of this dialog.
         */
        getName: function () {
            return this._.name;
        },

        /**
         * Gets a dialog UI element object from a dialog page.
         *
         *        dialogObj.getContentElement( 'tabId', 'elementId' ).setValue( 'Example' );
         *
         * @param {String} pageId id of dialog page.
         * @param {String} elementId id of UI element.
         * @returns {CKEDITOR.ui.dialog.uiElement} The dialog UI element.
         */
        getContentElement: function (pageId, elementId) {
            var page = this._.contents[pageId];
            return page && page[elementId];
        },

        /**
         * Gets the value of a dialog UI element.
         *
         *        alert( dialogObj.getValueOf( 'tabId', 'elementId' ) );
         *
         * @param {String} pageId id of dialog page.
         * @param {String} elementId id of UI element.
         * @returns {Object} The value of the UI element.
         */
        getValueOf: function (pageId, elementId) {
            return this.getContentElement(pageId, elementId).getValue();
        },

        /**
         * Sets the value of a dialog UI element.
         *
         *        dialogObj.setValueOf( 'tabId', 'elementId', 'Example' );
         *
         * @param {String} pageId id of the dialog page.
         * @param {String} elementId id of the UI element.
         * @param {Object} value The new value of the UI element.
         */
        setValueOf: function (pageId, elementId, value) {
            return this.getContentElement(pageId, elementId).setValue(value);
        },

        /**
         * Gets the UI element of a button in the dialog's button row.
         *
         *        @returns {CKEDITOR.ui.dialog.button} The button object.
         *
         * @param {String} id The id of the button.
         */
        getButton: function (id) {
            return this._.buttons[id];
        },

        /**
         * Simulates a click to a dialog button in the dialog's button row.
         *
         * @returns The return value of the dialog's `click` event.
         *
         * @param {String} id The id of the button.
         */
        click: function (id) {
            return this._.buttons[id].click();
        },

        /**
         * Disables a dialog button.
         *
         * @param {String} id The id of the button.
         */
        disableButton: function (id) {
            return this._.buttons[id].disable();
        },

        /**
         * Enables a dialog button.
         *
         * @param {String} id The id of the button.
         */
        enableButton: function (id) {
            return this._.buttons[id].enable();
        },

        /**
         * Gets the number of pages in the dialog.
         *
         * @returns {Number} Page count.
         */
        getPageCount: function () {
            return this._.pageCount;
        },

        /**
         * Gets the editor instance which opened this dialog.
         *
         * @returns {CKEDITOR.editor} Parent editor instances.
         */
        getParentEditor: function () {
            return this._.editor;
        },

        /**
         * Gets the element that was selected when opening the dialog, if any.
         *
         * @returns {CKEDITOR.dom.element} The element that was selected, or `null`.
         */
        getSelectedElement: function () {
            return this.getParentEditor().getSelection().getSelectedElement();
        },

        /**
         * Adds element to dialog's focusable list.
         *
         * @param {CKEDITOR.dom.element} element
         * @param {Number} [index]
         */
        addFocusable: function (element, index) {
            if (typeof index == 'undefined') {
                index = this._.focusList.length;
                this._.focusList.push(new Focusable(this, element, index));
            } else {
                this._.focusList.splice(index, 0, new Focusable(this, element, index));
                for (var i = index + 1; i < this._.focusList.length; i++)
                    this._.focusList[i].focusIndex++;
            }
        }
    };

    CKEDITOR.tools.extend(CKEDITOR.dialog, {
        /**
         * Registers a dialog.
         *
         *        // Full sample plugin, which does not only register a dialog window but also adds an item to the context menu.
         *        // To open the dialog window, choose "Open dialog" in the context menu.
         *        CKEDITOR.plugins.add( 'myplugin', {
         *			init: function( editor ) {
         *				editor.addCommand( 'mydialog',new CKEDITOR.dialogCommand( 'mydialog' ) );
         *
         *				if ( editor.contextMenu ) {
         *					editor.addMenuGroup( 'mygroup', 10 );
         *					editor.addMenuItem( 'My Dialog', {
         *						label: 'Open dialog',
         *						command: 'mydialog',
         *						group: 'mygroup'
         *					} );
         *					editor.contextMenu.addListener( function( element ) {
         *						return { 'My Dialog': CKEDITOR.TRISTATE_OFF };
         *					} );
         *				}
         *
         *				CKEDITOR.dialog.add( 'mydialog', function( api ) {
         *					// CKEDITOR.dialog.definition
         *					var dialogDefinition = {
         *						title: 'Sample dialog',
         *						minWidth: 390,
         *						minHeight: 130,
         *						contents: [
         *							{
         *								id: 'tab1',
         *								label: 'Label',
         *								title: 'Title',
         *								expand: true,
         *								padding: 0,
         *								elements: [
         *									{
         *										type: 'html',
         *										html: '<p>This is some sample HTML content.</p>'
         *									},
         *									{
         *										type: 'textarea',
         *										id: 'textareaId',
         *										rows: 4,
         *										cols: 40
         *									}
         *								]
         *							}
         *						],
         *						buttons: [ CKEDITOR.dialog.okButton, CKEDITOR.dialog.cancelButton ],
         *						onOk: function() {
         *							// "this" is now a CKEDITOR.dialog object.
         *							// Accessing dialog elements:
         *							var textareaObj = this.getContentElement( 'tab1', 'textareaId' );
         *							alert( "You have entered: " + textareaObj.getValue() );
         *						}
         *					};
         *
         *					return dialogDefinition;
         *				} );
         *			}
         *		} );
         *
         *        CKEDITOR.replace( 'editor1', { extraPlugins: 'myplugin' } );
         *
         * @static
         * @param {String} name The dialog's name.
         * @param {Function/String} dialogDefinition
         * A function returning the dialog's definition, or the URL to the `.js` file holding the function.
         * The function should accept an argument `editor` which is the current editor instance, and
         * return an object conforming to {@link CKEDITOR.dialog.definition}.
         * @see CKEDITOR.dialog.definition
         */
        add: function (name, dialogDefinition) {
            // Avoid path registration from multiple instances override definition.
            if (!this._.dialogDefinitions[name] || typeof dialogDefinition == 'function')
                this._.dialogDefinitions[name] = dialogDefinition;
        },

        /**
         * @static
         * @todo
         */
        exists: function (name) {
            return !!this._.dialogDefinitions[name];
        },

        /**
         * @static
         * @todo
         */
        getCurrent: function () {
            return CKEDITOR.dialog._.currentTop;
        },

        /**
         * Check whether tab wasn't removed by {@link CKEDITOR.config#removeDialogTabs}.
         *
         * @since 4.1
         * @static
         * @param {CKEDITOR.editor} editor
         * @param {String} dialogName
         * @param {String} tabName
         * @returns {Boolean}
         */
        isTabEnabled: function (editor, dialogName, tabName) {
            var cfg = editor.config.removeDialogTabs;

            return !(cfg && cfg.match(new RegExp('(?:^|;)' + dialogName + ':' + tabName + '(?:$|;)', 'i')));
        },

        /**
         * The default OK button for dialogs. Fires the `ok` event and closes the dialog if the event succeeds.
         *
         * @static
         * @method
         */
        okButton: (function () {
            var retval = function (editor, override) {
                override = override || {};
                return CKEDITOR.tools.extend({
                    id: 'ok',
                    type: 'button',
                    label: editor.lang.common.ok,
                    'class': 'cke_dialog_ui_button_ok',
                    onClick: function (evt) {
                        var dialog = evt.data.dialog;
                        if (dialog.fire('ok', {hide: true}).hide !== false)
                            dialog.hide();
                    }
                }, override, true);
            };
            retval.type = 'button';
            retval.override = function (override) {
                return CKEDITOR.tools.extend(function (editor) {
                    return retval(editor, override);
                }, {type: 'button'}, true);
            };
            return retval;
        })(),

        /**
         * The default cancel button for dialogs. Fires the `cancel` event and
         * closes the dialog if no UI element value changed.
         *
         * @static
         * @method
         */
        cancelButton: (function () {
            var retval = function (editor, override) {
                override = override || {};
                return CKEDITOR.tools.extend({
                    id: 'cancel',
                    type: 'button',
                    label: editor.lang.common.cancel,
                    'class': 'cke_dialog_ui_button_cancel',
                    onClick: function (evt) {
                        var dialog = evt.data.dialog;
                        if (dialog.fire('cancel', {hide: true}).hide !== false)
                            dialog.hide();
                    }
                }, override, true);
            };
            retval.type = 'button';
            retval.override = function (override) {
                return CKEDITOR.tools.extend(function (editor) {
                    return retval(editor, override);
                }, {type: 'button'}, true);
            };
            return retval;
        })(),

        /**
         * Registers a dialog UI element.
         *
         * @static
         * @param {String} typeName The name of the UI element.
         * @param {Function} builder The function to build the UI element.
         */
        addUIElement: function (typeName, builder) {
            this._.uiElementBuilders[typeName] = builder;
        }
    });

    CKEDITOR.dialog._ = {
        uiElementBuilders: {},

        dialogDefinitions: {},

        currentTop: null,

        currentZIndex: null
    };

    // "Inherit" (copy actually) from CKEDITOR.event.
    CKEDITOR.event.implementOn(CKEDITOR.dialog);
    CKEDITOR.event.implementOn(CKEDITOR.dialog.prototype);

    var defaultDialogDefinition = {
        resizable: CKEDITOR.DIALOG_RESIZE_BOTH,
        minWidth: 600,
        minHeight: 400,
        buttons: [CKEDITOR.dialog.okButton, CKEDITOR.dialog.cancelButton]
    };

    // Tool function used to return an item from an array based on its id
    // property.
    var getById = function (array, id, recurse) {
        for (var i = 0, item;
             (item = array[i]); i++) {
            if (item.id == id)
                return item;
            if (recurse && item[recurse]) {
                var retval = getById(item[recurse], id, recurse);
                if (retval)
                    return retval;
            }
        }
        return null;
    };

    // Tool function used to add an item into an array.
    var addById = function (array, newItem, nextSiblingId, recurse, nullIfNotFound) {
        if (nextSiblingId) {
            for (var i = 0, item;
                 (item = array[i]); i++) {
                if (item.id == nextSiblingId) {
                    array.splice(i, 0, newItem);
                    return newItem;
                }

                if (recurse && item[recurse]) {
                    var retval = addById(item[recurse], newItem, nextSiblingId, recurse, true);
                    if (retval)
                        return retval;
                }
            }

            if (nullIfNotFound)
                return null;
        }

        array.push(newItem);
        return newItem;
    };

    // Tool function used to remove an item from an array based on its id.
    var removeById = function (array, id, recurse) {
        for (var i = 0, item;
             (item = array[i]); i++) {
            if (item.id == id)
                return array.splice(i, 1);
            if (recurse && item[recurse]) {
                var retval = removeById(item[recurse], id, recurse);
                if (retval)
                    return retval;
            }
        }
        return null;
    };

    /**
     * This class is not really part of the API. It is the `definition` property value
     * passed to `dialogDefinition` event handlers.
     *
     *        CKEDITOR.on( 'dialogDefinition', function( evt ) {
     *			var definition = evt.data.definition;
     *			var content = definition.getContents( 'page1' );
     * 			// ...
     *		} );
     *
     * @private
     * @class CKEDITOR.dialog.definitionObject
     * @extends CKEDITOR.dialog.definition
     * @constructor Creates a definitionObject class instance.
     */
    var definitionObject = function (dialog, dialogDefinition) {
        // TODO : Check if needed.
        this.dialog = dialog;

        // Transform the contents entries in contentObjects.
        var contents = dialogDefinition.contents;
        for (var i = 0, content;
             (content = contents[i]); i++)
            contents[i] = content && new contentObject(dialog, content);

        CKEDITOR.tools.extend(this, dialogDefinition);
    };

    definitionObject.prototype = {
        /**
         * Gets a content definition.
         *
         * @param {String} id The id of the content definition.
         * @returns {CKEDITOR.dialog.definition.content} The content definition matching id.
         */
        getContents: function (id) {
            return getById(this.contents, id);
        },

        /**
         * Gets a button definition.
         *
         * @param {String} id The id of the button definition.
         * @returns {CKEDITOR.dialog.definition.button} The button definition matching id.
         */
        getButton: function (id) {
            return getById(this.buttons, id);
        },

        /**
         * Adds a content definition object under this dialog definition.
         *
         * @param {CKEDITOR.dialog.definition.content} contentDefinition The
         * content definition.
         * @param {String} [nextSiblingId] The id of an existing content
         * definition which the new content definition will be inserted
         * before. Omit if the new content definition is to be inserted as
         * the last item.
         * @returns {CKEDITOR.dialog.definition.content} The inserted content definition.
         */
        addContents: function (contentDefinition, nextSiblingId) {
            return addById(this.contents, contentDefinition, nextSiblingId);
        },

        /**
         * Adds a button definition object under this dialog definition.
         *
         * @param {CKEDITOR.dialog.definition.button} buttonDefinition The
         * button definition.
         * @param {String} [nextSiblingId] The id of an existing button
         * definition which the new button definition will be inserted
         * before. Omit if the new button definition is to be inserted as
         * the last item.
         * @returns {CKEDITOR.dialog.definition.button} The inserted button definition.
         */
        addButton: function (buttonDefinition, nextSiblingId) {
            return addById(this.buttons, buttonDefinition, nextSiblingId);
        },

        /**
         * Removes a content definition from this dialog definition.
         *
         * @param {String} id The id of the content definition to be removed.
         * @returns {CKEDITOR.dialog.definition.content} The removed content definition.
         */
        removeContents: function (id) {
            removeById(this.contents, id);
        },

        /**
         * Removes a button definition from the dialog definition.
         *
         * @param {String} id The id of the button definition to be removed.
         * @returns {CKEDITOR.dialog.definition.button} The removed button definition.
         */
        removeButton: function (id) {
            removeById(this.buttons, id);
        }
    };

    /**
     * This class is not really part of the API. It is the template of the
     * objects representing content pages inside the
     * CKEDITOR.dialog.definitionObject.
     *
     *        CKEDITOR.on( 'dialogDefinition', function( evt ) {
     *			var definition = evt.data.definition;
     *			var content = definition.getContents( 'page1' );
     *			content.remove( 'textInput1' );
     *			// ...
     *		} );
     *
     * @private
     * @class CKEDITOR.dialog.definition.contentObject
     * @constructor Creates a contentObject class instance.
     */
    function contentObject(dialog, contentDefinition) {
        this._ = {
            dialog: dialog
        };

        CKEDITOR.tools.extend(this, contentDefinition);
    }

    contentObject.prototype = {
        /**
         * Gets a UI element definition under the content definition.
         *
         * @param {String} id The id of the UI element definition.
         * @returns {CKEDITOR.dialog.definition.uiElement}
         */
        get: function (id) {
            return getById(this.elements, id, 'children');
        },

        /**
         * Adds a UI element definition to the content definition.
         *
         * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition The
         * UI elemnet definition to be added.
         * @param {String} nextSiblingId The id of an existing UI element
         * definition which the new UI element definition will be inserted
         * before. Omit if the new button definition is to be inserted as
         * the last item.
         * @returns {CKEDITOR.dialog.definition.uiElement} The element definition inserted.
         */
        add: function (elementDefinition, nextSiblingId) {
            return addById(this.elements, elementDefinition, nextSiblingId, 'children');
        },

        /**
         * Removes a UI element definition from the content definition.
         *
         * @param {String} id The id of the UI element definition to be removed.
         * @returns {CKEDITOR.dialog.definition.uiElement} The element definition removed.
         */
        remove: function (id) {
            removeById(this.elements, id, 'children');
        }
    };

    function initDragAndDrop(dialog) {
        var lastCoords = null,
            abstractDialogCoords = null,
            element = dialog.getElement().getFirst(),
            editor = dialog.getParentEditor(),
            magnetDistance = editor.config.dialog_magnetDistance,
            margins = CKEDITOR.skin.margins || [0, 0, 0, 0];

        if (typeof magnetDistance == 'undefined')
            magnetDistance = 20;

        function mouseMoveHandler(evt) {
            var dialogSize = dialog.getSize(),
                viewPaneSize = CKEDITOR.document.getWindow().getViewPaneSize(),
                x = evt.data.$.screenX,
                y = evt.data.$.screenY,
                dx = x - lastCoords.x,
                dy = y - lastCoords.y,
                realX, realY;

            lastCoords = {x: x, y: y};
            abstractDialogCoords.x += dx;
            abstractDialogCoords.y += dy;

            if (abstractDialogCoords.x + margins[3] < magnetDistance)
                realX = -margins[3];
            else if (abstractDialogCoords.x - margins[1] > viewPaneSize.width - dialogSize.width - magnetDistance)
                realX = viewPaneSize.width - dialogSize.width + (editor.lang.dir == 'rtl' ? 0 : margins[1]);
            else
                realX = abstractDialogCoords.x;

            if (abstractDialogCoords.y + margins[0] < magnetDistance)
                realY = -margins[0];
            else if (abstractDialogCoords.y - margins[2] > viewPaneSize.height - dialogSize.height - magnetDistance)
                realY = viewPaneSize.height - dialogSize.height + margins[2];
            else
                realY = abstractDialogCoords.y;

            dialog.move(realX, realY, 1);

            evt.data.preventDefault();
        }

        function mouseUpHandler(evt) {
            CKEDITOR.document.removeListener('mousemove', mouseMoveHandler);
            CKEDITOR.document.removeListener('mouseup', mouseUpHandler);

            if (CKEDITOR.env.ie6Compat) {
                var coverDoc = currentCover.getChild(0).getFrameDocument();
                coverDoc.removeListener('mousemove', mouseMoveHandler);
                coverDoc.removeListener('mouseup', mouseUpHandler);
            }
        }

        dialog.parts.title.on('mousedown', function (evt) {
            lastCoords = {x: evt.data.$.screenX, y: evt.data.$.screenY};

            CKEDITOR.document.on('mousemove', mouseMoveHandler);
            CKEDITOR.document.on('mouseup', mouseUpHandler);
            abstractDialogCoords = dialog.getPosition();

            if (CKEDITOR.env.ie6Compat) {
                var coverDoc = currentCover.getChild(0).getFrameDocument();
                coverDoc.on('mousemove', mouseMoveHandler);
                coverDoc.on('mouseup', mouseUpHandler);
            }

            evt.data.preventDefault();
        }, dialog);
    }

    function initResizeHandles(dialog) {
        var def = dialog.definition,
            resizable = def.resizable;

        if (resizable == CKEDITOR.DIALOG_RESIZE_NONE)
            return;

        var editor = dialog.getParentEditor();
        var wrapperWidth, wrapperHeight, viewSize, origin, startSize, dialogCover;

        var mouseDownFn = CKEDITOR.tools.addFunction(function ($event) {
            startSize = dialog.getSize();

            var content = dialog.parts.contents,
                iframeDialog = content.$.getElementsByTagName('iframe').length;

            // Shim to help capturing "mousemove" over iframe.
            if (iframeDialog) {
                dialogCover = CKEDITOR.dom.element.createFromHtml('<div class="cke_dialog_resize_cover" style="height: 100%; position: absolute; width: 100%;"></div>');
                content.append(dialogCover);
            }

            // Calculate the offset between content and chrome size.
            wrapperHeight = startSize.height - dialog.parts.contents.getSize('height', !(CKEDITOR.env.gecko || CKEDITOR.env.ie && CKEDITOR.env.quirks));
            wrapperWidth = startSize.width - dialog.parts.contents.getSize('width', 1);

            origin = {x: $event.screenX, y: $event.screenY};

            viewSize = CKEDITOR.document.getWindow().getViewPaneSize();

            CKEDITOR.document.on('mousemove', mouseMoveHandler);
            CKEDITOR.document.on('mouseup', mouseUpHandler);

            if (CKEDITOR.env.ie6Compat) {
                var coverDoc = currentCover.getChild(0).getFrameDocument();
                coverDoc.on('mousemove', mouseMoveHandler);
                coverDoc.on('mouseup', mouseUpHandler);
            }

            $event.preventDefault && $event.preventDefault();
        });

        // Prepend the grip to the dialog.
        dialog.on('load', function () {
            var direction = '';
            if (resizable == CKEDITOR.DIALOG_RESIZE_WIDTH)
                direction = ' cke_resizer_horizontal';
            else if (resizable == CKEDITOR.DIALOG_RESIZE_HEIGHT)
                direction = ' cke_resizer_vertical';
            var resizer = CKEDITOR.dom.element.createFromHtml(
                '<div' +
                ' class="cke_resizer' + direction + ' cke_resizer_' + editor.lang.dir + '"' +
                ' title="' + CKEDITOR.tools.htmlEncode(editor.lang.common.resize) + '"' +
                ' onmousedown="CKEDITOR.tools.callFunction(' + mouseDownFn + ', event )">' +
                // BLACK LOWER RIGHT TRIANGLE (ltr)
                // BLACK LOWER LEFT TRIANGLE (rtl)
                (editor.lang.dir == 'ltr' ? '\u25E2' : '\u25E3') +
                '</div>');
            dialog.parts.footer.append(resizer, 1);
        });
        editor.on('destroy', function () {
            CKEDITOR.tools.removeFunction(mouseDownFn);
        });

        function mouseMoveHandler(evt) {
            var rtl = editor.lang.dir == 'rtl',
                dx = (evt.data.$.screenX - origin.x) * (rtl ? -1 : 1),
                dy = evt.data.$.screenY - origin.y,
                width = startSize.width,
                height = startSize.height,
                internalWidth = width + dx * (dialog._.moved ? 1 : 2),
                internalHeight = height + dy * (dialog._.moved ? 1 : 2),
                element = dialog._.element.getFirst(),
                right = rtl && element.getComputedStyle('right'),
                position = dialog.getPosition();

            if (position.y + internalHeight > viewSize.height)
                internalHeight = viewSize.height - position.y;

            if ((rtl ? right : position.x) + internalWidth > viewSize.width)
                internalWidth = viewSize.width - (rtl ? right : position.x);

            // Make sure the dialog will not be resized to the wrong side when it's in the leftmost position for RTL.
            if ((resizable == CKEDITOR.DIALOG_RESIZE_WIDTH || resizable == CKEDITOR.DIALOG_RESIZE_BOTH))
                width = Math.max(def.minWidth || 0, internalWidth - wrapperWidth);

            if (resizable == CKEDITOR.DIALOG_RESIZE_HEIGHT || resizable == CKEDITOR.DIALOG_RESIZE_BOTH)
                height = Math.max(def.minHeight || 0, internalHeight - wrapperHeight);

            dialog.resize(width, height);

            if (!dialog._.moved)
                dialog.layout();

            evt.data.preventDefault();
        }

        function mouseUpHandler() {
            CKEDITOR.document.removeListener('mouseup', mouseUpHandler);
            CKEDITOR.document.removeListener('mousemove', mouseMoveHandler);

            if (dialogCover) {
                dialogCover.remove();
                dialogCover = null;
            }

            if (CKEDITOR.env.ie6Compat) {
                var coverDoc = currentCover.getChild(0).getFrameDocument();
                coverDoc.removeListener('mouseup', mouseUpHandler);
                coverDoc.removeListener('mousemove', mouseMoveHandler);
            }
        }
    }

    var resizeCover;
    // Caching resuable covers and allowing only one cover
    // on screen.
    var covers = {},
        currentCover;

    function cancelEvent(ev) {
        ev.data.preventDefault(1);
    }

    function showCover(editor) {
        var win = CKEDITOR.document.getWindow();
        var config = editor.config,
            backgroundColorStyle = config.dialog_backgroundCoverColor || 'white',
            backgroundCoverOpacity = config.dialog_backgroundCoverOpacity,
            baseFloatZIndex = config.baseFloatZIndex,
            coverKey = CKEDITOR.tools.genKey(backgroundColorStyle, backgroundCoverOpacity, baseFloatZIndex),
            coverElement = covers[coverKey];

        if (!coverElement) {
            var html = [
                '<div tabIndex="-1" style="position: ', (CKEDITOR.env.ie6Compat ? 'absolute' : 'fixed'),
                '; z-index: ', baseFloatZIndex,
                '; top: 0px; left: 0px; ',
                (!CKEDITOR.env.ie6Compat ? 'background-color: ' + backgroundColorStyle : ''),
                '" class="cke_dialog_background_cover">'
            ];

            if (CKEDITOR.env.ie6Compat) {
                // Support for custom document.domain in IE.
                var iframeHtml = '<html><body style=\\\'background-color:' + backgroundColorStyle + ';\\\'></body></html>';

                html.push('<iframe' +
                    ' hidefocus="true"' +
                    ' frameborder="0"' +
                    ' id="cke_dialog_background_iframe"' +
                    ' src="javascript:');

                html.push('void((function(){' + encodeURIComponent(
                    'document.open();' +
                    // Support for custom document.domain in IE.
                    '(' + CKEDITOR.tools.fixDomain + ')();' +
                    'document.write( \'' + iframeHtml + '\' );' +
                    'document.close();'
                ) + '})())');

                html.push('"' +
                    ' style="' +
                    'position:absolute;' +
                    'left:0;' +
                    'top:0;' +
                    'width:100%;' +
                    'height: 100%;' +
                    'filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0)">' +
                    '</iframe>');
            }

            html.push('</div>');

            coverElement = CKEDITOR.dom.element.createFromHtml(html.join(''));
            coverElement.setOpacity(backgroundCoverOpacity != undefined ? backgroundCoverOpacity : 0.5);

            coverElement.on('keydown', cancelEvent);
            coverElement.on('keypress', cancelEvent);
            coverElement.on('keyup', cancelEvent);

            coverElement.appendTo(CKEDITOR.document.getBody());
            covers[coverKey] = coverElement;
        } else
            coverElement.show();

        // Makes the dialog cover a focus holder as well.
        editor.focusManager.add(coverElement);

        currentCover = coverElement;
        var resizeFunc = function () {
            var size = win.getViewPaneSize();
            coverElement.setStyles({
                width: size.width + 'px',
                height: size.height + 'px'
            });
        };

        var scrollFunc = function () {
            var pos = win.getScrollPosition(),
                cursor = CKEDITOR.dialog._.currentTop;
            coverElement.setStyles({
                left: pos.x + 'px',
                top: pos.y + 'px'
            });

            if (cursor) {
                do {
                    var dialogPos = cursor.getPosition();
                    cursor.move(dialogPos.x, dialogPos.y);
                } while ((cursor = cursor._.parentDialog));
            }
        };

        resizeCover = resizeFunc;
        win.on('resize', resizeFunc);
        resizeFunc();
        // Using Safari/Mac, focus must be kept where it is (#7027)
        if (!(CKEDITOR.env.mac && CKEDITOR.env.webkit))
            coverElement.focus();

        if (CKEDITOR.env.ie6Compat) {
            // IE BUG: win.$.onscroll assignment doesn't work.. it must be window.onscroll.
            // So we need to invent a really funny way to make it work.
            var myScrollHandler = function () {
                scrollFunc();
                arguments.callee.prevScrollHandler.apply(this, arguments);
            };
            win.$.setTimeout(function () {
                myScrollHandler.prevScrollHandler = window.onscroll ||
                    function () {
                    };
                window.onscroll = myScrollHandler;
            }, 0);
            scrollFunc();
        }
    }

    function hideCover(editor) {
        if (!currentCover)
            return;

        editor.focusManager.remove(currentCover);
        var win = CKEDITOR.document.getWindow();
        currentCover.hide();
        win.removeListener('resize', resizeCover);

        if (CKEDITOR.env.ie6Compat) {
            win.$.setTimeout(function () {
                var prevScrollHandler = window.onscroll && window.onscroll.prevScrollHandler;
                window.onscroll = prevScrollHandler || null;
            }, 0);
        }
        resizeCover = null;
    }

    function removeCovers() {
        for (var coverId in covers)
            covers[coverId].remove();
        covers = {};
    }

    var accessKeyProcessors = {};

    var accessKeyDownHandler = function (evt) {
        var ctrl = evt.data.$.ctrlKey || evt.data.$.metaKey,
            alt = evt.data.$.altKey,
            shift = evt.data.$.shiftKey,
            key = String.fromCharCode(evt.data.$.keyCode),
            keyProcessor = accessKeyProcessors[(ctrl ? 'CTRL+' : '') + (alt ? 'ALT+' : '') + (shift ? 'SHIFT+' : '') + key];

        if (!keyProcessor || !keyProcessor.length)
            return;

        keyProcessor = keyProcessor[keyProcessor.length - 1];
        keyProcessor.keydown && keyProcessor.keydown.call(keyProcessor.uiElement, keyProcessor.dialog, keyProcessor.key);
        evt.data.preventDefault();
    };

    var accessKeyUpHandler = function (evt) {
        var ctrl = evt.data.$.ctrlKey || evt.data.$.metaKey,
            alt = evt.data.$.altKey,
            shift = evt.data.$.shiftKey,
            key = String.fromCharCode(evt.data.$.keyCode),
            keyProcessor = accessKeyProcessors[(ctrl ? 'CTRL+' : '') + (alt ? 'ALT+' : '') + (shift ? 'SHIFT+' : '') + key];

        if (!keyProcessor || !keyProcessor.length)
            return;

        keyProcessor = keyProcessor[keyProcessor.length - 1];
        if (keyProcessor.keyup) {
            keyProcessor.keyup.call(keyProcessor.uiElement, keyProcessor.dialog, keyProcessor.key);
            evt.data.preventDefault();
        }
    };

    var registerAccessKey = function (uiElement, dialog, key, downFunc, upFunc) {
        var procList = accessKeyProcessors[key] || (accessKeyProcessors[key] = []);
        procList.push({
            uiElement: uiElement,
            dialog: dialog,
            key: key,
            keyup: upFunc || uiElement.accessKeyUp,
            keydown: downFunc || uiElement.accessKeyDown
        });
    };

    var unregisterAccessKey = function (obj) {
        for (var i in accessKeyProcessors) {
            var list = accessKeyProcessors[i];
            for (var j = list.length - 1; j >= 0; j--) {
                if (list[j].dialog == obj || list[j].uiElement == obj)
                    list.splice(j, 1);
            }
            if (list.length === 0)
                delete accessKeyProcessors[i];
        }
    };

    var tabAccessKeyUp = function (dialog, key) {
        if (dialog._.accessKeyMap[key])
            dialog.selectPage(dialog._.accessKeyMap[key]);
    };

    var tabAccessKeyDown = function (dialog, key) {
    };

    (function () {
        CKEDITOR.ui.dialog = {
            /**
             * The base class of all dialog UI elements.
             *
             * @class CKEDITOR.ui.dialog.uiElement
             * @constructor Creates a uiElement class instance.
             * @param {CKEDITOR.dialog} dialog Parent dialog object.
             * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition Element
             * definition.
             *
             * Accepted fields:
             *
             * * `id` (Required) The id of the UI element. See {@link CKEDITOR.dialog#getContentElement}.
             * * `type` (Required) The type of the UI element. The
             *     value to this field specifies which UI element class will be used to
             *     generate the final widget.
             * * `title` (Optional) The popup tooltip for the UI
             *     element.
             * * `hidden` (Optional) A flag that tells if the element
             *     should be initially visible.
             * * `className` (Optional) Additional CSS class names
             *     to add to the UI element. Separated by space.
             * * `style` (Optional) Additional CSS inline styles
             *     to add to the UI element. A semicolon (;) is required after the last
             *     style declaration.
             * * `accessKey` (Optional) The alphanumeric access key
             *     for this element. Access keys are automatically prefixed by CTRL.
             * * `on*` (Optional) Any UI element definition field that
             *     starts with `on` followed immediately by a capital letter and
             *     probably more letters is an event handler. Event handlers may be further
             *     divided into registered event handlers and DOM event handlers. Please
             *     refer to {@link CKEDITOR.ui.dialog.uiElement#registerEvents} and
             *     {@link CKEDITOR.ui.dialog.uiElement#eventProcessors} for more information.
             *
             * @param {Array} htmlList
             * List of HTML code to be added to the dialog's content area.
             * @param {Function/String} [nodeNameArg='div']
             * A function returning a string, or a simple string for the node name for
             * the root DOM node.
             * @param {Function/Object} [stylesArg={}]
             * A function returning an object, or a simple object for CSS styles applied
             * to the DOM node.
             * @param {Function/Object} [attributesArg={}]
             * A fucntion returning an object, or a simple object for attributes applied
             * to the DOM node.
             * @param {Function/String} [contentsArg='']
             * A function returning a string, or a simple string for the HTML code inside
             * the root DOM node. Default is empty string.
             */
            uiElement: function (dialog, elementDefinition, htmlList, nodeNameArg, stylesArg, attributesArg, contentsArg) {
                if (arguments.length < 4)
                    return;

                var nodeName = (nodeNameArg.call ? nodeNameArg(elementDefinition) : nodeNameArg) || 'div',
                    html = ['<', nodeName, ' '],
                    styles = (stylesArg && stylesArg.call ? stylesArg(elementDefinition) : stylesArg) || {},
                    attributes = (attributesArg && attributesArg.call ? attributesArg(elementDefinition) : attributesArg) || {},
                    innerHTML = (contentsArg && contentsArg.call ? contentsArg.call(this, dialog, elementDefinition) : contentsArg) || '',
                    domId = this.domId = attributes.id || CKEDITOR.tools.getNextId() + '_uiElement',
                    id = this.id = elementDefinition.id,
                    i;

                if (elementDefinition.requiredContent && !dialog.getParentEditor().filter.check(elementDefinition.requiredContent)) {
                    styles.display = 'none';
                    this.notAllowed = true;
                }

                // Set the id, a unique id is required for getElement() to work.
                attributes.id = domId;

                // Set the type and definition CSS class names.
                var classes = {};
                if (elementDefinition.type)
                    classes['cke_dialog_ui_' + elementDefinition.type] = 1;
                if (elementDefinition.className)
                    classes[elementDefinition.className] = 1;
                if (elementDefinition.disabled)
                    classes['cke_disabled'] = 1;

                var attributeClasses = (attributes['class'] && attributes['class'].split) ? attributes['class'].split(' ') : [];
                for (i = 0; i < attributeClasses.length; i++) {
                    if (attributeClasses[i])
                        classes[attributeClasses[i]] = 1;
                }
                var finalClasses = [];
                for (i in classes)
                    finalClasses.push(i);
                attributes['class'] = finalClasses.join(' ');

                // Set the popup tooltop.
                if (elementDefinition.title)
                    attributes.title = elementDefinition.title;

                // Write the inline CSS styles.
                var styleStr = (elementDefinition.style || '').split(';');

                // Element alignment support.
                if (elementDefinition.align) {
                    var align = elementDefinition.align;
                    styles['margin-left'] = align == 'left' ? 0 : 'auto';
                    styles['margin-right'] = align == 'right' ? 0 : 'auto';
                }

                for (i in styles)
                    styleStr.push(i + ':' + styles[i]);
                if (elementDefinition.hidden)
                    styleStr.push('display:none');
                for (i = styleStr.length - 1; i >= 0; i--) {
                    if (styleStr[i] === '')
                        styleStr.splice(i, 1);
                }
                if (styleStr.length > 0)
                    attributes.style = (attributes.style ? (attributes.style + '; ') : '') + styleStr.join('; ');

                // Write the attributes.
                for (i in attributes)
                    html.push(i + '="' + CKEDITOR.tools.htmlEncode(attributes[i]) + '" ');

                // Write the content HTML.
                html.push('>', innerHTML, '</', nodeName, '>');

                // Add contents to the parent HTML array.
                htmlList.push(html.join(''));

                (this._ || (this._ = {})).dialog = dialog;

                // Override isChanged if it is defined in element definition.
                if (typeof (elementDefinition.isChanged) == 'boolean')
                    this.isChanged = function () {
                        return elementDefinition.isChanged;
                    };
                if (typeof (elementDefinition.isChanged) == 'function')
                    this.isChanged = elementDefinition.isChanged;

                // Overload 'get(set)Value' on definition.
                if (typeof (elementDefinition.setValue) == 'function') {
                    this.setValue = CKEDITOR.tools.override(this.setValue, function (org) {
                        return function (val) {
                            org.call(this, elementDefinition.setValue.call(this, val));
                        };
                    });
                }

                if (typeof (elementDefinition.getValue) == 'function') {
                    this.getValue = CKEDITOR.tools.override(this.getValue, function (org) {
                        return function () {
                            return elementDefinition.getValue.call(this, org.call(this));
                        };
                    });
                }

                // Add events.
                CKEDITOR.event.implementOn(this);

                this.registerEvents(elementDefinition);
                if (this.accessKeyUp && this.accessKeyDown && elementDefinition.accessKey)
                    registerAccessKey(this, dialog, 'CTRL+' + elementDefinition.accessKey);

                var me = this;
                dialog.on('load', function () {
                    var input = me.getInputElement();
                    if (input) {
                        var focusClass = me.type in {
                            'checkbox': 1,
                            'ratio': 1
                        } && CKEDITOR.env.ie && CKEDITOR.env.version < 8 ? 'cke_dialog_ui_focused' : '';
                        input.on('focus', function () {
                            dialog._.tabBarMode = false;
                            dialog._.hasFocus = true;
                            me.fire('focus');
                            focusClass && this.addClass(focusClass);

                        });

                        input.on('blur', function () {
                            me.fire('blur');
                            focusClass && this.removeClass(focusClass);
                        });
                    }
                });

                // Completes this object with everything we have in the
                // definition.
                CKEDITOR.tools.extend(this, elementDefinition);

                // Register the object as a tab focus if it can be included.
                if (this.keyboardFocusable) {
                    this.tabIndex = elementDefinition.tabIndex || 0;

                    this.focusIndex = dialog._.focusList.push(this) - 1;
                    this.on('focus', function () {
                        dialog._.currentFocusIndex = me.focusIndex;
                    });
                }
            },

            /**
             * Horizontal layout box for dialog UI elements, auto-expends to available width of container.
             *
             * @class CKEDITOR.ui.dialog.hbox
             * @extends CKEDITOR.ui.dialog.uiElement
             * @constructor Creates a hbox class instance.
             * @param {CKEDITOR.dialog} dialog Parent dialog object.
             * @param {Array} childObjList
             * Array of {@link CKEDITOR.ui.dialog.uiElement} objects inside this container.
             * @param {Array} childHtmlList
             * Array of HTML code that correspond to the HTML output of all the
             * objects in childObjList.
             * @param {Array} htmlList
             * Array of HTML code that this element will output to.
             * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
             * The element definition. Accepted fields:
             *
             * * `widths` (Optional) The widths of child cells.
             * * `height` (Optional) The height of the layout.
             * * `padding` (Optional) The padding width inside child cells.
             * * `align` (Optional) The alignment of the whole layout.
             */
            hbox: function (dialog, childObjList, childHtmlList, htmlList, elementDefinition) {
                if (arguments.length < 4)
                    return;

                this._ || (this._ = {});

                var children = this._.children = childObjList,
                    widths = elementDefinition && elementDefinition.widths || null,
                    height = elementDefinition && elementDefinition.height || null,
                    styles = {},
                    i;
                /** @ignore */
                var innerHTML = function () {
                    var html = ['<tbody><tr class="cke_dialog_ui_hbox">'];
                    for (i = 0; i < childHtmlList.length; i++) {
                        var className = 'cke_dialog_ui_hbox_child',
                            styles = [];
                        if (i === 0)
                            className = 'cke_dialog_ui_hbox_first';
                        if (i == childHtmlList.length - 1)
                            className = 'cke_dialog_ui_hbox_last';
                        html.push('<td class="', className, '" role="presentation" ');
                        if (widths) {
                            if (widths[i])
                                styles.push('width:' + cssLength(widths[i]));
                        } else
                            styles.push('width:' + Math.floor(100 / childHtmlList.length) + '%');
                        if (height)
                            styles.push('height:' + cssLength(height));
                        if (elementDefinition && elementDefinition.padding != undefined)
                            styles.push('padding:' + cssLength(elementDefinition.padding));
                        // In IE Quirks alignment has to be done on table cells. (#7324)
                        if (CKEDITOR.env.ie && CKEDITOR.env.quirks && children[i].align)
                            styles.push('text-align:' + children[i].align);
                        if (styles.length > 0)
                            html.push('style="' + styles.join('; ') + '" ');
                        html.push('>', childHtmlList[i], '</td>');
                    }
                    html.push('</tr></tbody>');
                    return html.join('');
                };

                var attribs = {role: 'presentation'};
                elementDefinition && elementDefinition.align && (attribs.align = elementDefinition.align);

                CKEDITOR.ui.dialog.uiElement.call(this, dialog, elementDefinition || {type: 'hbox'}, htmlList, 'table', styles, attribs, innerHTML);
            },

            /**
             * Vertical layout box for dialog UI elements.
             *
             * @class CKEDITOR.ui.dialog.vbox
             * @extends CKEDITOR.ui.dialog.hbox
             * @constructor Creates a vbox class instance.
             * @param {CKEDITOR.dialog} dialog Parent dialog object.
             * @param {Array} childObjList
             * Array of {@link CKEDITOR.ui.dialog.uiElement} objects inside this container.
             * @param {Array} childHtmlList
             * Array of HTML code that correspond to the HTML output of all the
             * objects in childObjList.
             * @param {Array} htmlList Array of HTML code that this element will output to.
             * @param {CKEDITOR.dialog.definition.uiElement} elementDefinition
             * The element definition. Accepted fields:
             *
             * * `width` (Optional) The width of the layout.
             * * `heights` (Optional) The heights of individual cells.
             * * `align` (Optional) The alignment of the layout.
             * * `padding` (Optional) The padding width inside child cells.
             * * `expand` (Optional) Whether the layout should expand
             *     vertically to fill its container.
             */
            vbox: function (dialog, childObjList, childHtmlList, htmlList, elementDefinition) {
                if (arguments.length < 3)
                    return;

                this._ || (this._ = {});

                var children = this._.children = childObjList,
                    width = elementDefinition && elementDefinition.width || null,
                    heights = elementDefinition && elementDefinition.heights || null;
                /** @ignore */
                var innerHTML = function () {
                    var html = ['<table role="presentation" cellspacing="0" border="0" '];
                    html.push('style="');
                    if (elementDefinition && elementDefinition.expand)
                        html.push('height:100%;');
                    html.push('width:' + cssLength(width || '100%'), ';');

                    // (#10123) Temp fix for dialog broken layout in latest webkit.
                    if (CKEDITOR.env.webkit)
                        html.push('float:none;');

                    html.push('"');
                    html.push('align="', CKEDITOR.tools.htmlEncode(
                        (elementDefinition && elementDefinition.align) || (dialog.getParentEditor().lang.dir == 'ltr' ? 'left' : 'right')), '" ');

                    html.push('><tbody>');
                    for (var i = 0; i < childHtmlList.length; i++) {
                        var styles = [];
                        html.push('<tr><td role="presentation" ');
                        if (width)
                            styles.push('width:' + cssLength(width || '100%'));
                        if (heights)
                            styles.push('height:' + cssLength(heights[i]));
                        else if (elementDefinition && elementDefinition.expand)
                            styles.push('height:' + Math.floor(100 / childHtmlList.length) + '%');
                        if (elementDefinition && elementDefinition.padding != undefined)
                            styles.push('padding:' + cssLength(elementDefinition.padding));
                        // In IE Quirks alignment has to be done on table cells. (#7324)
                        if (CKEDITOR.env.ie && CKEDITOR.env.quirks && children[i].align)
                            styles.push('text-align:' + children[i].align);
                        if (styles.length > 0)
                            html.push('style="', styles.join('; '), '" ');
                        html.push(' class="cke_dialog_ui_vbox_child">', childHtmlList[i], '</td></tr>');
                    }
                    html.push('</tbody></table>');
                    return html.join('');
                };
                CKEDITOR.ui.dialog.uiElement.call(this, dialog, elementDefinition || {type: 'vbox'}, htmlList, 'div', null, {role: 'presentation'}, innerHTML);
            }
        };
    })();

    /** @class CKEDITOR.ui.dialog.uiElement */
    CKEDITOR.ui.dialog.uiElement.prototype = {
        /**
         * Gets the root DOM element of this dialog UI object.
         *
         *        uiElement.getElement().hide();
         *
         * @returns {CKEDITOR.dom.element} Root DOM element of UI object.
         */
        getElement: function () {
            return CKEDITOR.document.getById(this.domId);
        },

        /**
         * Gets the DOM element that the user inputs values.
         *
         * This function is used by {@link #setValue}, {@link #getValue} and {@link #focus}. It should
         * be overrided in child classes where the input element isn't the root
         * element.
         *
         *        var rawValue = textInput.getInputElement().$.value;
         *
         * @returns {CKEDITOR.dom.element} The element where the user input values.
         */
        getInputElement: function () {
            return this.getElement();
        },

        /**
         * Gets the parent dialog object containing this UI element.
         *
         *        var dialog = uiElement.getDialog();
         *
         * @returns {CKEDITOR.dialog} Parent dialog object.
         */
        getDialog: function () {
            return this._.dialog;
        },

        /**
         * Sets the value of this dialog UI object.
         *
         *        uiElement.setValue( 'Dingo' );
         *
         * @chainable
         * @param {Object} value The new value.
         * @param {Boolean} noChangeEvent Internal commit, to supress `change` event on this element.
         */
        setValue: function (value, noChangeEvent) {
            this.getInputElement().setValue(value);
            !noChangeEvent && this.fire('change', {value: value});
            return this;
        },

        /**
         * Gets the current value of this dialog UI object.
         *
         *        var myValue = uiElement.getValue();
         *
         * @returns {Object} The current value.
         */
        getValue: function () {
            return this.getInputElement().getValue();
        },

        /**
         * Tells whether the UI object's value has changed.
         *
         *        if ( uiElement.isChanged() )
         *            confirm( 'Value changed! Continue?' );
         *
         * @returns {Boolean} `true` if changed, `false` if not changed.
         */
        isChanged: function () {
            // Override in input classes.
            return false;
        },

        /**
         * Selects the parent tab of this element. Usually called by focus() or overridden focus() methods.
         *
         *        focus : function() {
         *			this.selectParentTab();
         *			// do something else.
         *		}
         *
         * @chainable
         */
        selectParentTab: function () {
            var element = this.getInputElement(),
                cursor = element,
                tabId;
            while ((cursor = cursor.getParent()) && cursor.$.className.search('cke_dialog_page_contents') == -1) {
                /*jsl:pass*/
            }

            // Some widgets don't have parent tabs (e.g. OK and Cancel buttons).
            if (!cursor)
                return this;

            tabId = cursor.getAttribute('name');
            // Avoid duplicate select.
            if (this._.dialog._.currentTabId != tabId)
                this._.dialog.selectPage(tabId);
            return this;
        },

        /**
         * Puts the focus to the UI object. Switches tabs if the UI object isn't in the active tab page.
         *
         *        uiElement.focus();
         *
         * @chainable
         */
        focus: function () {
            this.selectParentTab().getInputElement().focus();
            return this;
        },

        /**
         * Registers the `on*` event handlers defined in the element definition.
         *
         * The default behavior of this function is:
         *
         * 1. If the on* event is defined in the class's eventProcesors list,
         *     then the registration is delegated to the corresponding function
         *     in the eventProcessors list.
         * 2. If the on* event is not defined in the eventProcessors list, then
         *     register the event handler under the corresponding DOM event of
         *     the UI element's input DOM element (as defined by the return value
         *     of {@link #getInputElement}).
         *
         * This function is only called at UI element instantiation, but can
         * be overridded in child classes if they require more flexibility.
         *
         * @chainable
         * @param {CKEDITOR.dialog.definition.uiElement} definition The UI element
         * definition.
         */
        registerEvents: function (definition) {
            var regex = /^on([A-Z]\w+)/,
                match;

            var registerDomEvent = function (uiElement, dialog, eventName, func) {
                dialog.on('load', function () {
                    uiElement.getInputElement().on(eventName, func, uiElement);
                });
            };

            for (var i in definition) {
                if (!(match = i.match(regex)))
                    continue;
                if (this.eventProcessors[i])
                    this.eventProcessors[i].call(this, this._.dialog, definition[i]);
                else
                    registerDomEvent(this, this._.dialog, match[1].toLowerCase(), definition[i]);
            }

            return this;
        },

        /**
         * The event processor list used by
         * {@link CKEDITOR.ui.dialog.uiElement#getInputElement} at UI element
         * instantiation. The default list defines three `on*` events:
         *
         * 1. `onLoad` - Called when the element's parent dialog opens for the
         *     first time.
         * 2. `onShow` - Called whenever the element's parent dialog opens.
         * 3. `onHide` - Called whenever the element's parent dialog closes.
         *
         *        // This connects the 'click' event in CKEDITOR.ui.dialog.button to onClick
         *        // handlers in the UI element's definitions.
         *        CKEDITOR.ui.dialog.button.eventProcessors = CKEDITOR.tools.extend( {},
         *            CKEDITOR.ui.dialog.uiElement.prototype.eventProcessors,
         *            { onClick : function( dialog, func ) { this.on( 'click', func ); } },
         *            true
         *        );
         *
         * @property {Object}
         */
        eventProcessors: {
            onLoad: function (dialog, func) {
                dialog.on('load', func, this);
            },

            onShow: function (dialog, func) {
                dialog.on('show', func, this);
            },

            onHide: function (dialog, func) {
                dialog.on('hide', func, this);
            }
        },

        /**
         * The default handler for a UI element's access key down event, which
         * tries to put focus to the UI element.
         *
         * Can be overridded in child classes for more sophisticaed behavior.
         *
         * @param {CKEDITOR.dialog} dialog The parent dialog object.
         * @param {String} key The key combination pressed. Since access keys
         * are defined to always include the `CTRL` key, its value should always
         * include a `'CTRL+'` prefix.
         */
        accessKeyDown: function (dialog, key) {
            this.focus();
        },

        /**
         * The default handler for a UI element's access key up event, which
         * does nothing.
         *
         * Can be overridded in child classes for more sophisticated behavior.
         *
         * @param {CKEDITOR.dialog} dialog The parent dialog object.
         * @param {String} key The key combination pressed. Since access keys
         * are defined to always include the `CTRL` key, its value should always
         * include a `'CTRL+'` prefix.
         */
        accessKeyUp: function (dialog, key) {
        },

        /**
         * Disables a UI element.
         */
        disable: function () {
            var element = this.getElement(),
                input = this.getInputElement();
            input.setAttribute('disabled', 'true');
            element.addClass('cke_disabled');
        },

        /**
         * Enables a UI element.
         */
        enable: function () {
            var element = this.getElement(),
                input = this.getInputElement();
            input.removeAttribute('disabled');
            element.removeClass('cke_disabled');
        },

        /**
         * Determines whether an UI element is enabled or not.
         *
         * @returns {Boolean} Whether the UI element is enabled.
         */
        isEnabled: function () {
            return !this.getElement().hasClass('cke_disabled');
        },

        /**
         * Determines whether an UI element is visible or not.
         *
         * @returns {Boolean} Whether the UI element is visible.
         */
        isVisible: function () {
            return this.getInputElement().isVisible();
        },

        /**
         * Determines whether an UI element is focus-able or not.
         * Focus-able is defined as being both visible and enabled.
         *
         * @returns {Boolean} Whether the UI element can be focused.
         */
        isFocusable: function () {
            if (!this.isEnabled() || !this.isVisible())
                return false;
            return true;
        }
    };

    /** @class CKEDITOR.ui.dialog.hbox */
    CKEDITOR.ui.dialog.hbox.prototype = CKEDITOR.tools.extend(new CKEDITOR.ui.dialog.uiElement, {
        /**
         * Gets a child UI element inside this container.
         *
         *        var checkbox = hbox.getChild( [0,1] );
         *        checkbox.setValue( true );
         *
         * @param {Array/Number} indices An array or a single number to indicate the child's
         * position in the container's descendant tree. Omit to get all the children in an array.
         * @returns {Array/CKEDITOR.ui.dialog.uiElement} Array of all UI elements in the container
         * if no argument given, or the specified UI element if indices is given.
         */
        getChild: function (indices) {
            // If no arguments, return a clone of the children array.
            if (arguments.length < 1)
                return this._.children.concat();

            // If indices isn't array, make it one.
            if (!indices.splice)
                indices = [indices];

            // Retrieve the child element according to tree position.
            if (indices.length < 2)
                return this._.children[indices[0]];
            else
                return (this._.children[indices[0]] && this._.children[indices[0]].getChild) ? this._.children[indices[0]].getChild(indices.slice(1, indices.length)) : null;
        }
    }, true);

    CKEDITOR.ui.dialog.vbox.prototype = new CKEDITOR.ui.dialog.hbox();

    (function () {
        var commonBuilder = {
            build: function (dialog, elementDefinition, output) {
                var children = elementDefinition.children,
                    child,
                    childHtmlList = [],
                    childObjList = [];
                for (var i = 0;
                     (i < children.length && (child = children[i])); i++) {
                    var childHtml = [];
                    childHtmlList.push(childHtml);
                    childObjList.push(CKEDITOR.dialog._.uiElementBuilders[child.type].build(dialog, child, childHtml));
                }
                return new CKEDITOR.ui.dialog[elementDefinition.type](dialog, childObjList, childHtmlList, output, elementDefinition);
            }
        };

        CKEDITOR.dialog.addUIElement('hbox', commonBuilder);
        CKEDITOR.dialog.addUIElement('vbox', commonBuilder);
    })();

    /**
     * Generic dialog command. It opens a specific dialog when executed.
     *
     *        // Register the "link" command, which opens the "link" dialog.
     *        editor.addCommand( 'link', new CKEDITOR.dialogCommand( 'link' ) );
     *
     * @class
     * @constructor Creates a dialogCommand class instance.
     * @extends CKEDITOR.commandDefinition
     * @param {String} dialogName The name of the dialog to open when executing
     * this command.
     * @param {Object} [ext] Additional command definition's properties.
     */
    CKEDITOR.dialogCommand = function (dialogName, ext) {
        this.dialogName = dialogName;
        CKEDITOR.tools.extend(this, ext, true);
    };

    CKEDITOR.dialogCommand.prototype = {
        exec: function (editor) {
            editor.openDialog(this.dialogName);
        },

        // Dialog commands just open a dialog ui, thus require no undo logic,
        // undo support should dedicate to specific dialog implementation.
        canUndo: false,

        editorFocus: 1
    };

    (function () {
        var notEmptyRegex = /^([a]|[^a])+$/,
            integerRegex = /^\d*$/,
            numberRegex = /^\d*(?:\.\d+)?$/,
            htmlLengthRegex = /^(((\d*(\.\d+))|(\d*))(px|\%)?)?$/,
            cssLengthRegex = /^(((\d*(\.\d+))|(\d*))(px|em|ex|in|cm|mm|pt|pc|\%)?)?$/i,
            inlineStyleRegex = /^(\s*[\w-]+\s*:\s*[^:;]+(?:;|$))*$/;

        CKEDITOR.VALIDATE_OR = 1;
        CKEDITOR.VALIDATE_AND = 2;

        CKEDITOR.dialog.validate = {
            functions: function () {
                var args = arguments;
                return function () {
                    /**
                     * It's important for validate functions to be able to accept the value
                     * as argument in addition to this.getValue(), so that it is possible to
                     * combine validate functions together to make more sophisticated
                     * validators.
                     */
                    var value = this && this.getValue ? this.getValue() : args[0];

                    var msg = undefined,
                        relation = CKEDITOR.VALIDATE_AND,
                        functions = [],
                        i;

                    for (i = 0; i < args.length; i++) {
                        if (typeof (args[i]) == 'function')
                            functions.push(args[i]);
                        else
                            break;
                    }

                    if (i < args.length && typeof (args[i]) == 'string') {
                        msg = args[i];
                        i++;
                    }

                    if (i < args.length && typeof (args[i]) == 'number')
                        relation = args[i];

                    var passed = (relation == CKEDITOR.VALIDATE_AND ? true : false);
                    for (i = 0; i < functions.length; i++) {
                        if (relation == CKEDITOR.VALIDATE_AND)
                            passed = passed && functions[i](value);
                        else
                            passed = passed || functions[i](value);
                    }

                    return !passed ? msg : true;
                };
            },

            regex: function (regex, msg) {
                /*
				 * Can be greatly shortened by deriving from functions validator if code size
				 * turns out to be more important than performance.
				 */
                return function () {
                    var value = this && this.getValue ? this.getValue() : arguments[0];
                    return !regex.test(value) ? msg : true;
                };
            },

            notEmpty: function (msg) {
                return this.regex(notEmptyRegex, msg);
            },

            integer: function (msg) {
                return this.regex(integerRegex, msg);
            },

            'number': function (msg) {
                return this.regex(numberRegex, msg);
            },

            'cssLength': function (msg) {
                return this.functions(function (val) {
                    return cssLengthRegex.test(CKEDITOR.tools.trim(val));
                }, msg);
            },

            'htmlLength': function (msg) {
                return this.functions(function (val) {
                    return htmlLengthRegex.test(CKEDITOR.tools.trim(val));
                }, msg);
            },

            'inlineStyle': function (msg) {
                return this.functions(function (val) {
                    return inlineStyleRegex.test(CKEDITOR.tools.trim(val));
                }, msg);
            },

            equals: function (value, msg) {
                return this.functions(function (val) {
                    return val == value;
                }, msg);
            },

            notEqual: function (value, msg) {
                return this.functions(function (val) {
                    return val != value;
                }, msg);
            }
        };

        CKEDITOR.on('instanceDestroyed', function (evt) {
            // Remove dialog cover on last instance destroy.
            if (CKEDITOR.tools.isEmpty(CKEDITOR.instances)) {
                var currentTopDialog;
                while ((currentTopDialog = CKEDITOR.dialog._.currentTop))
                    currentTopDialog.hide();
                removeCovers();
            }

            var dialogs = evt.editor._.storedDialogs;
            for (var name in dialogs)
                dialogs[name].destroy();

        });

    })();

    // Extend the CKEDITOR.editor class with dialog specific functions.
    CKEDITOR.tools.extend(CKEDITOR.editor.prototype, {
        /**
         * Loads and opens a registered dialog.
         *
         *        CKEDITOR.instances.editor1.openDialog( 'smiley' );
         *
         * @member CKEDITOR.editor
         * @param {String} dialogName The registered name of the dialog.
         * @param {Function} callback The function to be invoked after dialog instance created.
         * @returns {CKEDITOR.dialog} The dialog object corresponding to the dialog displayed.
         * `null` if the dialog name is not registered.
         * @see CKEDITOR.dialog#add
         */
        openDialog: function (dialogName, callback) {
            var dialog = null, dialogDefinitions = CKEDITOR.dialog._.dialogDefinitions[dialogName];

            if (CKEDITOR.dialog._.currentTop === null)
                showCover(this);

            // If the dialogDefinition is already loaded, open it immediately.
            if (typeof dialogDefinitions == 'function') {
                var storedDialogs = this._.storedDialogs || (this._.storedDialogs = {});

                dialog = storedDialogs[dialogName] || (storedDialogs[dialogName] = new CKEDITOR.dialog(this, dialogName));

                callback && callback.call(dialog, dialog);
                dialog.show();

            } else if (dialogDefinitions == 'failed') {
                hideCover(this);
                throw new Error('[CKEDITOR.dialog.openDialog] Dialog "' + dialogName + '" failed when loading definition.');
            } else if (typeof dialogDefinitions == 'string') {

                CKEDITOR.scriptLoader.load(CKEDITOR.getUrl(dialogDefinitions),
                    function () {
                        var dialogDefinition = CKEDITOR.dialog._.dialogDefinitions[dialogName];
                        // In case of plugin error, mark it as loading failed.
                        if (typeof dialogDefinition != 'function')
                            CKEDITOR.dialog._.dialogDefinitions[dialogName] = 'failed';

                        this.openDialog(dialogName, callback);
                    }, this, 0, 1);
            }

            CKEDITOR.skin.loadPart('dialog');

            return dialog;
        }
    });
})();

CKEDITOR.plugins.add('dialog', {
    requires: 'dialogui',
    init: function (editor) {
        editor.on('doubleclick', function (evt) {
            if (evt.data.dialog)
                editor.openDialog(evt.data.dialog);
        }, null, null, 999);
    }
});

// Dialog related configurations.

/**
 * The color of the dialog background cover. It should be a valid CSS color string.
 *
 *        config.dialog_backgroundCoverColor = 'rgb(255, 254, 253)';
 *
 * @cfg {String} [dialog_backgroundCoverColor='white']
 * @member CKEDITOR.config
 */

/**
 * The opacity of the dialog background cover. It should be a number within the
 * range `[0.0, 1.0]`.
 *
 *        config.dialog_backgroundCoverOpacity = 0.7;
 *
 * @cfg {Number} [dialog_backgroundCoverOpacity=0.5]
 * @member CKEDITOR.config
 */

/**
 * If the dialog has more than one tab, put focus into the first tab as soon as dialog is opened.
 *
 *        config.dialog_startupFocusTab = true;
 *
 * @cfg {Boolean} [dialog_startupFocusTab=false]
 * @member CKEDITOR.config
 */

/**
 * The distance of magnetic borders used in moving and resizing dialogs,
 * measured in pixels.
 *
 *        config.dialog_magnetDistance = 30;
 *
 * @cfg {Number} [dialog_magnetDistance=20]
 * @member CKEDITOR.config
 */

/**
 * The guideline to follow when generating the dialog buttons. There are 3 possible options:
 *
 * * `'OS'` - the buttons will be displayed in the default order of the user's OS;
 * * `'ltr'` - for Left-To-Right order;
 * * `'rtl'` - for Right-To-Left order.
 *
 * Example:
 *
 *        config.dialog_buttonsOrder = 'rtl';
 *
 * @since 3.5
 * @cfg {String} [dialog_buttonsOrder='OS']
 * @member CKEDITOR.config
 */

/**
 * The dialog contents to removed. It's a string composed by dialog name and tab name with a colon between them.
 *
 * Separate each pair with semicolon (see example).
 *
 * **Note:** All names are case-sensitive.
 *
 * **Note:** Be cautious when specifying dialog tabs that are mandatory,
 * like `'info'`, dialog functionality might be broken because of this!
 *
 *        config.removeDialogTabs = 'flash:advanced;image:Link';
 *
 * @since 3.5
 * @cfg {String} [removeDialogTabs='']
 * @member CKEDITOR.config
 */

/**
 * Tells if user should not be asked to confirm close, if any dialog field was modified.
 * By default it is set to `false` meaning that the confirmation dialog will be shown.
 *
 *        config.dialog_noConfirmCancel = true;
 *
 * @since 4.3
 * @cfg {Boolean} [dialog_noConfirmCancel=false]
 * @member CKEDITOR.config
 */

/**
 * Fired when a dialog definition is about to be used to create a dialog into
 * an editor instance. This event makes it possible to customize the definition
 * before creating it.
 *
 * Note that this event is called only the first time a specific dialog is
 * opened. Successive openings will use the cached dialog, and this event will
 * not get fired.
 *
 * @event dialogDefinition
 * @member CKEDITOR
 * @param {CKEDITOR.dialog.definition} data The dialog defination that
 * is being loaded.
 * @param {CKEDITOR.editor} editor The editor instance that will use the dialog.
 */

/**
 * Fired when a tab is going to be selected in a dialog.
 *
 * @event selectPage
 * @member CKEDITOR.dialog
 * @param data
 * @param {String} data.page The id of the page that it's gonna be selected.
 * @param {String} data.currentPage The id of the current page.
 */

/**
 * Fired when the user tries to dismiss a dialog.
 *
 * @event cancel
 * @member CKEDITOR.dialog
 * @param data
 * @param {Boolean} data.hide Whether the event should proceed or not.
 */

/**
 * Fired when the user tries to confirm a dialog.
 *
 * @event ok
 * @member CKEDITOR.dialog
 * @param data
 * @param {Boolean} data.hide Whether the event should proceed or not.
 */

/**
 * Fired when a dialog is shown.
 *
 * @event show
 * @member CKEDITOR.dialog
 */

/**
 * Fired when a dialog is shown.
 *
 * @event dialogShow
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {CKEDITOR.dialog} data The opened dialog instance.
 */

/**
 * Fired when a dialog is hidden.
 *
 * @event hide
 * @member CKEDITOR.dialog
 */

/**
 * Fired when a dialog is hidden.
 *
 * @event dialogHide
 * @member CKEDITOR.editor
 * @param {CKEDITOR.editor} editor This editor instance.
 * @param {CKEDITOR.dialog} data The hidden dialog instance.
 */

/**
 * Fired when a dialog is being resized. The event is fired on
 * both the {@link CKEDITOR.dialog} object and the dialog instance
 * since 3.5.3, previously it's available only in the global object.
 *
 * @static
 * @event resize
 * @member CKEDITOR.dialog
 * @param data
 * @param {CKEDITOR.dialog} data.dialog The dialog being resized (if
 * it's fired on the dialog itself, this parameter isn't sent).
 * @param {String} data.skin The skin name.
 * @param {Number} data.width The new width.
 * @param {Number} data.height The new height.
 */

/**
 * Fired when a dialog is being resized. The event is fired on
 * both the {@link CKEDITOR.dialog} object and the dialog instance
 * since 3.5.3, previously it's available only in the global object.
 *
 * @since 3.5
 * @event resize
 * @member CKEDITOR.dialog
 * @param data
 * @param {Number} data.width The new width.
 * @param {Number} data.height The new height.
 */
